This museum (former pumping station) is recommended in my guidebook, so I went to check it out. It's located at Praca das Amoreiras (metro station: Rato), and you can see the end of the Roman aqueduct there. I went on a Sunday and entry was free. According to their website, entry on all weekends in 2018 is free, to tie in the 150th anniversary of EPAL. Note that there's a lunch break. Inside, this pumping station is like a cathedral. You can go up the steps at one end of the wall to view the reservoir from above. Then through still steeper and narrower steps, you can go further up to the roof to have some panoramic view of Lisbon and the aqueduct. I went on a day with drizzle and grey sky, so the view was a bit dull. There were only a few visitors the day I went. Very tranquil place.
It's off the tourist beaten track and interesting to visit.
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