Until 1967 this was the Prague sewage works. Built by an English engineer in 1885, it consists of a vast labyrinth of brick vaulted catacombs and is considered one of the most importa &t examples of Czech industrial architecture. You can poke around the cellars and see sand traps and sediment tanks on a 45 minute tour. In the sheds, there's an industrial heritage museum.

Admission 50Kč.