Museum Our Lord in the Attic (Ons' Lieve Heer op Solder) is one of the oldest museums in Amsterdam. The attic of this 17th century canal house conceals a secret church, where Catholics of the Dutch Reformed Church who were unable to worship in public held their services.
A merchant purchased the building during this period, and he and his family lived on the ground floor. Catholic masses were officially forbidden from 1578 onwards, but the Protestant governors of Amsterdam generally turned a blind eye, as long as churches such as this one were unrecognisable from the outside.
The lower floors of the building became a museum in 1888 and today contain refurbished kitchens and other rooms housing a collection of church paintings, silver, and various religious artifacts. Visitors can explore the building’s narrow passageways and stairways while marveling at the ornate furniture and works of art. The church organ, located opposite the altar, was built by Hendrik Meyer in 1794 especially for the church, and is still regularly played.