Petit Bé is a tidal island near Saint-Malo, France, close to the larger island of Grand Bé. There is a fort built in the 17th century. It was part of the defense belt designed by Vauban to protect the city of Saint-Malo from British and Dutch fleets. This belt also included the walls of the Saint Malo, Fort National, Fort Harbour, Fort de la Conchée, and the forts of Cézembre and Pointe de la Varde; these last two have been destroyed. The forts were built by the Saint-Malo engineer Siméon Garangeau.
The fort belonged to the French army until 1885. Later, the army turned the fort over to the city of Saint-Malo. It became a Monument historique in 1921, but was neglected until 2000, when the city gave a free rent to a non-profit organization for the renovation and visiting. At low tide the island can be reached on foot from the nearby Bon-Secours beach.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.