Orvieto: This city hides beautiful architectural curiosities to visit. His famous cathedral, perched precariously on a virtually vertical cliff made of craggy tufaceous stone, that seems ready to crumble under the weight of its magnificent 14th-century cathedral is a masterpiece of Italian Gothic architecture. Another must-see for visitor is its labyrinth of caves and tunnels that lie underground. Dug deep into the volcanic rock, these secret hidden tunnels are open to guided tours.
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