Recommended and surprising
The museum is a cultural center that you can visit plus it has many events. It's in the old Central Valley, in Belém neighborhood, close to the Mosteiro dos Jeronimos, the Coach Museum, the Tower of Belém and the Monument to the Discoveries. The architecture is striking with monumental and brick facades. But on entering it is perhaps even more surprising, as it's a machinery site of the old power plant that lit Lisbon. The tours are very educational, showing the history, operation and creation of electricity. In addition, at the end of the tour there is a play area. There's also a spectacular view of the river.