Ons' Lieve Heer op Solder (Our Lord in the Attic) is 14th century house, now turned a museum. On the top three floors of the house, it was built a hidden clandestine church (schuilkerk) in the 17th century when the Dutch Reformed Church was prohibited to worship in public.
Oudezijds Voorburgwal 38
| Monday | 10:00 - 17:00 |
| Tuesday | 10:00 - 17:00 |
| Wednesday | 10:00 - 17:00 |
| Thursday | 10:00 - 17:00 |
| Friday | 10:00 - 17:00 |
| Saturday | 10:00 - 17:00 |
| Sunday | 13:00 - 17:00 |