Mount Saint-Michel in Normandy, France

Mount Saint-Michel is located on a tidal island in Normandy, France. It is home to the unusual Benedictine Abbey and steepled church (built between the 11th and 16th centuries), daringly placed at the top of the mount. Many underground crypts and chapels had to be built to compensate for this weight. The tides in the area can vary greatly, at roughly 14 metres between high and low water marks.