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12 of the Most Impressive Castles in the World

Check out our guide to the world's most stunning castles at

Calm night in Grindelwald, Switzerland. | Photo by @sennarelax

The Trulli houses of Alberobello in the Puglia region of Italy were built by settlers from limestone and not much else. An impressive dry stone building technique meant the houses could be collapsed simply by pulling out a keystone. Anyone else thinking they look like hobbit houses? Not just us then.