Stockholm's 19th c. telephone network, which once covered the city in thousands of wires—it was decommissioned in 1913, when underground cables made it obsolete. The Telephone Tower, built in 1887, was damaged by a fire in 1952 and demolished the following year.
© Tekniska Museet
© Tekniska Museet
Tons more images on Tekniska Museet's superb flickr https://www.flickr.com/photos/tekniskamuseet/albums/72157629583341315