They didn’t accept my international student card (ISIC) telling me I’m older than 26. The tower is gorgeous from the outside. Inside not so special. The history is interesting though.
If you take the tour here don't expect to find yourself inside the library hall. You'll only be allowed to look inside the hall from a doorway. Though the view from the tower is nice.
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Astronomical Tower of Clementinum
Mariánské nám. 190/5 (Karlova 190/1) 110 00Praha Česká republika