Mont Saint Michel is a 257-acre tidal island on the French coast, hosting a monastery (later used as a prison) and a medieval town. Wanaii films posted this beautiful drone footage of it.
The structural composition of the town exemplifies the feudal society that constructed it: on top, God, the abbey and monastery; below, the great
halls; then stores and housing; and at the bottom, outside the walls, houses for fishermen and farmers.
St. Michaels' Mount is its historical counterpart, a 50-acre tidal island on the English coast that was gifted to the French monastery in medieval times, but eventually lost by it. Less heavily fortified and built-up, it offers its own mystique but, sadly, no restaurants. It served as Castle Dracula in the 1979 movie. Here's a drone exploration of it posted by Joshua Paul Gardner.