overview opening hours admission The 6-floor building of the former waterworks overlooks the Letná plain. The tower, which is in total 38.3m in height, is crowned with a pyramidal roof. The top part of the tower features a column extension with a tower-clock. On the fifth floor there is a view gallery and a periscope which monitors some of the Prague’s monument. A Foucault pendulum has been installed in the foyer of the main staircase. opening hours During the summer holidays (between 29 June and 31 August 2026), the library and gallery will be open on a limited basis, only on Saturdays from 2.00 pm to 6.00 pm. historical building january—december mon closed tue 14:00—18:00 wed closed thu 14:00—18:00 fri closed sat—sun 14:00—18:00 The outdoor area of the tower is open to the public daily from 10:00 a.m. to 6:00 p.m. The building can be visited as part of a cultural program. Guided tours can be booked here. more about opening hours admission basic 75 CZK reduced 50 CZK Payments in cash or using a QR code. více o vstupném accessibility The annexe is accessible to wheelchair users from the courtyard. Access to the tower is not wheelchair-accessible; it is via a staircase only. admission basic 75 CZK reduced 50 CZK Payments in cash or using a QR code. opening hours During the summer holidays (between 29 June and 31 August 2026), the library and gallery will be open on a limited basis, only on Saturdays from 2.00 pm to 6.00 pm. historical building january—december mon closed tue 14:00—18:00 wed closed thu 14:00—18:00 fri closed sat—sun 14:00—18:00 The outdoor area of the tower is open to the public daily from 10:00 a.m. to 6:00 p.m. The building can be visited as part of a cultural program. Guided tours can be booked here.