Throw back thursday; last sunday:
"Ons’ Lieve Heer op Solder" ("Our Lord in the Attic") is one of the oldest and most remarkable museums in Amsterdam.
Behind the characteristic facade of the house by the canal lies a largely original 17th-century home and a complete hidden church. This hidden church ‘in the attic’ was built during the Reformation, when Catholics were forbidden to hold public services.
Plus as a bonus a nice view of the rooftops and yards never to be seen from street level.