Kasa fort/Padmadurg ( Raigad): Sambhaji Maharaj is credited for building around 1676, to keep a watch on the activities in the Arabian Sea.
The sea forts built by Shivaji Maharaj in such a manner that they were virtually impenetrable.

Underi and its sister fort Khanderi were key fortifications in the Maratha defence against the Siddi and British during the 17th century. Both forts were built on islands off the coast of Thal, near Alibaug.

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Rajmachi Fort:
The fort played a strategic role in the First Anglo-Maratha War.
Rajmachi has 2 fortified structures- the Shrivardhan fort and the Manaranjan fort.
My father often used to visit Rajmachi village as it was an anglers delight.

Harihar fort: constructed to look upon trade route through Gonda Ghat.British officer, Capt Briggs describes it as wonderful & writes; words can give no idea of its dreadful sleepness. It is perfectly straight for,I suppose 200’ and can only be compared to a ladder over 1/2

Harihar Fort: ladder over a height of nature.’ On top there is a small temple and a cave with water.

The fort was captured by Captain. Briggs from the Mughals in 1818 along with 17 other forts. 2/2

Suvarna Durg Fort:
Constructed during the reign of the Bijapur empire in the 17th century. It became among the many forts that Shivaji captured, it operated under the reign of the Maratha Peshwas until 1818. It’s name translates to ‘Golden Fort’, suggesting its significance.1/2

Suvarna Durg Fort: The fort was built for defence and ship-building, and is closely associated with the nearby land fort of Kanakadurg. Access to this fort is only by boats from the nearby Harnai port.2/2
Photo credit: Wikipedia

Vijaydurg,Sindhudurg district:
It is surrounded by Arabian Sea on three sides
Constructed in the regime of Raja Bhoj of Shilahar dynasty in 1205 (construction period 1193-1205). Fort was earlier known as 'Gheria ' as it is situated in the village 'Girye' 1/3
Photo credit-hdk_2710

Shivaji Maharaj seized this fort from Adil Shah of Bijapur in 1653 and renamed it to 'Vijay Durg ' as the then Hindu solar year 's name was 'Vijay ' (meaning victory)
This fort was also known as "Eastern Gibraltar" as it was impregnable for a long time due to its locational 2/3

Maratha warships were anchored in this creek. Vijaydurg has a 200m long, underwater tunnel connecting it to the village.
This is one of only two Maratha forts where Shivaji personally hoisted the saffron flag. The other fort is Torna.
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Ratnadurg Fort,Ratnagiri:
Horse shoe shaped fort.Built in the Bahamani period. Thereafter, it was under the rule of Adilshahi in 1660 A.D. 1670 A.D. Chatrapati Shivaji brought many forts in Konkan including the Ratnadurga fort under the Maratha regime.
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Main tourist attraction due to the Bhagawati Temple inside the fort.

It seems Rani of Jhasi had visited this fort before the battle of 1857.
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Tung fort,Lonavala : Built before 1600 CE by Adil Shah but was captured by Shivaj Maharaj.
Shape and structure suggest that its main function was as a watchtower overlooking Maval region of the Pawana and Mulshi valleys guarding the road to Pune city
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Korigad Fort,Lonavala,Pune:
Shivaji Maharaj incorporated this fort in Swarajya along with Lohgad, Visapur, Tung and Tikona in 1657. On March 11, 1818, Col. Prother invaded this fort but could not succeed even after prolonged fighting.
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Photo credit: Wikipedia

Finally he succeeded on 14th March, by dropping a cannon ball where the ammunition was stored. Along with this fort the British also conquered Ghangad.

To reach the fort, tourists need to trek for 45 minutes ,there are 1,000 steps.
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Torna fort: तोरणा किल्ला
This fort is believed to have been constructed by the Shiva Panth, followers of the Hindu god Shiva, in the 13th century.
A Menghai Devi temple, also referred to as the Tornaji temple, is situated near the entrance of the fort.
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This was the first fort to be captured by the Shivaji Maharaj in the year 1643, when he was just 16 years old and this formed the nucleus of Maratha Empire.
According to legend, this is one of only two Maratha forts where Shivaji Maharaj personally hoisted the saffron flag. 2/3

Torna fort was captured by the Mughals in the 18th century after assassinating Shambhaji raje.
Aurangzeb renamed the fort as Futulgaib.
By the “Treaty of Purandar” this fort was given to the Maratha confederacy during Peshwas 3/3

Tikona Fort/Vitandgad,Kamshet,Pune:
In 1657, Shivaji Maharaj brought entire Konkan, which had been Nizam territory, under his control when he conquered Tikona along with other forts.
This fort was a strategic nexus: the centre of control for the entire Pawana Mawal region
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Situated at a height of 3500 feet, the fort has high fortifications, large doorways, seven water tanks with clean water, temples,caves and a spectacular view from its topmost bastion.2/2

Lohagad fort:Pune
Several dynasties occupying it at different periods of time: Satavahanas, Chalukyas, Rashtrakutas, Yadavas, Bahamanis, Nizams, Mughals,Marathas
Shivaji Maharaj captured in 1648 AD, but he was forced to surrender it to the Mughals in 1665 AD
Recaptured -1670 AD

Built during 1713-1720 CE by Balaji Vishwanath, the first Peshwa of Maratha Empire.
Visapur fort was built much later than Lohagad but histories of the two forts are closely linked.
Huge carving of Hanuman,also several temples dedicated to Him all over the place
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Kenjalgad Fort, Wai, Satara: It is rhomboid shaped fort, atop Mahadev hill range at an elevation of 4269 ft
As per historical records,the fort dates back to 12th century and was constructed by Bhoja king. Later on, the fort was captured by different dynasties 1/2
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2/2 which include the Adil Shah,the Marathas, Mughals and British.
The fort is in ruins and not many historians visit it.

Kohoj Fort,Palghar:The fort is 800 years old and finds a mention in the Purandar treaty along with 22 other forts which were surrendered by Shivaji Maharaj to the Mughals on 11 June 1665. It was also an important fort for keeping a look on the nearby coast & safety of territory

SINHAGAD FORT:
Located on an cliff in the Bhuleswar range of the Sahyadri Range.
One of the most famous battles was fought by Tanaji Malusare in order to recapture the fort.Steep cliff leading to the fort was scaled with the help of a tamed monitor lizard named "Yashwanti"
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colloquially known as a ghorpad. Thereafter, a fierce battle ensued between Tanaji and his men versus the Mughal army headed by Udaybhan Singh Rathod. Maratha Army won the battle but Tanaji Malusare lost his life.

Upon hearing of Tanaji's death, Chhatrapati Shivaji expressed his remorse with the words, "Gad aala, pan Sinha gela" - "The Fort is captured, but the Lion is lost"

According to few historians, the name Sinhagad was given much “before” the battle and not “after” the battle
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IRSHALGAD: located btwn Matheran-Panvel
Irshalgad is actually a pinnacle and not a fort. Hardly any mention in history. May have been used as a watchtower to look after area between Manikgad and Prabalgad.Shivaji Maharaj conquered the region of Kalyan and Bhiwandi,up to Rairi

RATANGAD FORT,Ahmednagar:
It is 400 year old fort, which was captured by Shivaji Maharaj and may be used as a watchtower.
Ratangad is also called Jewels of the Fort.

The fort has four gates known as Ganesh, Hanuman, Konkan and Trimbak.

SALHER FORT,Nasik:
Battle of Salher is considered particularly significant as it is the first battle in which the Mughals lost on an open field.
The Mughal military machines (consisting of cavalry, infantry, and artillery) were outmatched by the light cavalry of the Marathas
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prominent Maratha Sardar and Shivaji Maharaj childhood friend Suryaji Kakde was killed by a Zamburak cannon in the battle.
The site of the highest fort in the Sahyadri mountains and the second highest peak at 1,567 metres (5,141 ft) after Kalsubai
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Harishchandragad,Ahmednagar:
Ancient fort. Remnants of Microlithic man have been discovered here.Built during Kalachuri dynasty,6th century.
Great sage Changdev (one who created the epic Tatvasaar), used to meditate here in the 14th century
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The various Puranas like Matsyapurana, Agnipurana and Skandapurana have many references about Harishchandragad.
Rohidas, Taramati and Harishchandra are the three peaks in Harishchandragad.
Marathas captured it in 1747 AD.
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MULHER FORT,Nasik: Mulher, Moragad, Salher, Hargad, Salota are in Dolbari range. Fort was built by Bagul dynasty, ruled 1308 A.D. to 1619 A.D.
During this dynasty, the world-famous ‘Mulheri Muth’, the sword-handle, was made
Aurangazeb conquered this fort, name as Aurangagad
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Soon , Shivaji Maharaj began a campaign in this region. Got Salher,Mulher and Chaulher under Maratha rule.
This feat resulted in the assimilation of the entire Baglan region into Swarajya.

CHAULHER FORT/ चौलेर किल्ला, Nasik:
The history is similar to the Salher and Mulher forts. The fort was ruled by King Gawali.This fort was under the control of Maratha empire until it was captured by British forces in 1818.

GAWLI FORT, Amravati:Constructed in 12th century.Was made of mud. The fort was built by the Bahamani Sultan Ahmad Shah in 1425-26.
Nizamshahi dynasty in 1574; Mughals in 1600; the Marathas in 1744, before it finally fell to the East India Company in 1803 AD.

JIVDHAN FORT,Pune: Built during the Satavahana period.
Jivdhan to Naneghat has an open field of 2–3 km, which gives any clear indication of enemy approach. British captured this fort in 1818 and destroyed all approaches. It was captured by Col. Prother and later destroyed.

HADSAR FORT, Junnar,Pune:Built during Satvahana period. It was important for the protection of the commercial trade route from Mawal region to Kalyan via Naneghat
This fort was mentioned in the Treaty of Purandar between Shivaji Maharaj & Mughals. Captured by British in 1818

NANEGHAT (नाणेघाट),Junnar,Pune:It is mountain pass in the Western Ghats range
Inscription at Naneghat, gives us insights into early years of the Satavahana dynasty under King Satakarni I and Queen Naganika .
Their marriage significant (political) event of Satakarni’s reign
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Satakarni I went on to rule most of northern Maharashtra. As the fame and power of Satakarni I grew, so did the stature of his queen, Naganika. Coins were minted in her name, an extraordinary event during these times.2/2

Chavand (चावंड किल्ला),Junnar,Pune: Under the rule of Shivaji Maharaj it was known as Prasannagad.The first Nizamshah, Nizam Ahmed acquired the fort after the dissolution of the Bahmanid Empire. The seventh Nizamshah was Burhanshah II.
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In 1636, the Mughals got the fort of Chavand by signing a treaty with the Nizams. On 1 May 1818 the British forces captured the fort from Marathas. Destroying each and every monument of the fort along with the route to reach the top of the fort.