During the Reformation, Catholics weren't allowed to openly practice their religion, so a hidden church in the attic of a house was established. Now known as "Our Lord in the Attic" Museum, it is the second oldest museum in Amsterdam. Guided tours are available. Every first Sunday of the month between October and April, you can join in an "attic celebration." The museum is open 10:00 to 17:00 Monday through Saturday, and 13:00 to 17:00 on Sunday and public holidays. Adults cost €8.00 and children ages 6 to 18 cost €4.00.
-Jessica E. Lipowski, Amsterdam Local Expert