Ons’ Lieve Heer op Solder is a Catholic Church was built on the top three floors of a canal house during the 1660s. At that time, it was prohibited to celebrate mass, so churches like this had to remain a secret.
To do this, they cut a large hole in the top three floors and supported the gap with iron bars.
While a bit strange, the invention and beauty found in the details are quite astounding.
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