This is the oldest museum in Amsterdam. 17th century, with a church in the attic. This is one you have got to stop in and see. Finding it may be a chore, but it's worth the hunt. The staff was very helpful in answering question. Don't forget the room in the basement near the restrooms.

This museum, also called Our Lord in the Attic, is actually a 17th-century town house. The most interesting part? There's a secret Catholic church in the attic. The church was built in the 1660s, when celebrating mass was officially forbidden. Authorities were tolerant, however, and many Catholics celebrated privately in homes and in secret chapels like this one. This history behind this museum/house is really interesting, and if you like old houses and history, it's a hit. The museum was set up well: you're given a brochure when you enter that tells you about each room, and there are arrows and numbers on the rooms to keep you from getting lost. This was one of my favorite discoveries in Amsterdam!