International and long distance telephone exchange, Žižkov, Prague

This building is not very interesting. But its story is interesting. It was built between 1972 and 1980 and was the largest building ever built in Czechoslovakia.
2500 employees worked there. They manually switched calls. In about ten years from building, the building was completely useless. Only a little bigger computer replaced all employees.
The building should be demolished in 2022. Its operation is too expensive.