Klementinum

Guided tour: baroque library hall and the astronomical tower

Tickets: Adults CZK 380, reduced (6–15, over 65) CZK 230, 16–26 CZK 300, family CZK 810; free up to age 5
Address: Two minutes on foot from the Old Town end of Charles Bridge; the tour meets at the entrance printed on your timed ticket

The tour ends in the baroque library hall, shelves running to the ceiling under gilded fresco work. You look in from the doorway rather than walk through, and it still stops you in your tracks. Then you climb the astronomical tower to the walkway near the top, where the red roofs and the castle open out all round. Slots are fixed and latecomers are not let in.