Mont Saint-Michel
Up in the north of France, there is a tiny island (population 44 people) capped by an abbey and surrounded by changing tides. In the old days, the island was only accessible when the tide was out, allowing people to make their pilgrimages and bring supplies, but even then, the muddy surroundings made for a dangerous slog. Now, there is a bridge connecting the island to the mainland and guided tours to help people safely navigate the mud flats. If you can believe it, we took almost 20,000 steps exploring the alleyways, ramparts, muddy beaches and rocky shores. It may be small in size, but that didn't mean we weren't exhausted by the time we were done.