Rising majestically out of the bay, Mont-Saint-Michel is once again a true island, at least during high tides. A crude, elevated causeway built in the 19th century once connected Mont-Saint-Michel to the mainland, allowing visitors to walk across to the spectacular rock. But in 2014, the causeway was removed and replaced by an elegant, curving bridge above the tidal flats. Now water flows freely around the monument at high tide, making the tiny island fortress a real island for the first time in more than a century.