This "floating railway" is one of the world's oldest monorail systems.

This church carved into the rocks is full of enchanting stone statues.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

Wander through the Corridor of Wonders in these stunning limestone caverns.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

Legend says this sacred tree was a gift from goddess Athena.

A closer look at this somewhat faded hotel by the Corinth Canal reveals the architectural undertones of a genius.

This legendary city has been a tourist attraction for centuries.

Underneath one of the region's most historic roads lies the home of Plato's successor.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

Monasteries on rock pillars, once accessible only by frayed ropes.

An islet filled with wooden houses where the open sea meets a lagoon.

A magical, if a bit tacky, 1960s castle conjures up medieval fairytales and Greek mythology.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This massive subterranean fissure is known as the "underground Grand Canyon."

A naturally beautiful, seemingly bottomless deep blue spring.

The remains of a military communications outpost still stand on this Greek island.