On the walking path from Monterosso to Vernazza, a small shrine dedicated to feline friends.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

This tiny chapel withstood a massive mudslide and flash flood.

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

An amazing clockwork museum in the Val de Travers holds examples of various prestigious legacies horological history.

The world's longest and deepest train tunnel.

One of the world's largest collections of pharmaceutical artifacts.

This long line of cement defensive wedges is named after the famous chocolate bar for obvious reasons.

This statue pays tribute to the iconic musician in the place where he recorded his final studio album.

These spooky and unusual stone formations create an underworldly landscape.

A study of Fascist era Art Deco design in Italy.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Cave shrine on Monte Pellegrino.

Every inch of this chapel is covered in craftsmanship from across the world.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.