At the southern tip of the island of Corsica, Bonifacio is the largest commune of the island. This fragile looking citadel sits precariously at 70 meters (230 ft) over the white limestone cliffs, eaten away by the wind and waves of the Mediterranean Sea. A naval haven throughout the century, Bonifacio is now a small marina for expensive yachts from around the world.
 
3. Castellfolit de la Roca (Spain): situated on a 50 meters (164 ft) high basalt crag

Located about 200 km southeast from Greece's mainland, the archipelago of Santorini is essentially what remains of an enormous volcanic explosion, destroying the earliest settlements on what was formerly a single island, and leading to the creation of the current geological caldera. Its spectacular physical beauty, along with a dynamic nightlife, have made the island one of Europe's tourist hotspots. The Minoan eruption, which occurred some 3,600 years ago at the height of the Minoan civilization, left a large caldera surrounded by volcanic ash deposits hundreds of feet deep and may have led indirectly to the collapse of the Minoan civilization on the island of Crete, 110 km (70 miles) to the south, through the creation of a gigantic tsunami. The giant central lagoon, more or less rectangular, mesures about 12 km by 7 km (8 mi by 4 mi) and is surrounded by 300 m (984 ft) high steep cliffs on three sides.
 
5. Manarola (Italy): Italy's most precariously placed town



Located in Liguria, Manarola is certainly one of Italy's most precariously placed towns. It’s hard to say just how old this village is, but ancient Roman texts have been found which celebrated the wines produced there. Today, you can still enjoy strolls through the vineyards, a walk on the Via dell’Amore (Path of Love) and its brightly colored buildings just near the edge.