An ancient site that has revealed incredible artifacts including portions of the Themistoclean Wall.

A historic building houses one of the most important archaeological institutes in Europe.

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

These ancient ruins hide in plain sight next to a dessert shop.

The ruins of an ancient fortification wall sit in front of and underneath this boutique hotel.

When construction began on this hotel, developers were surprised to find the ruins of an ancient civilization.

The only ancient site that remains on the south bank of the sacred Ilissos river.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

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

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The castle in the romantic landscape of Podyjí houses what may be Europe's largest collection of taxidermy dogs.

A small monument on the outskirts of Prague, where one of the bloodiest conflicts in the country's history was decided.

This fortress was designed to prevent a Nazi invasion but was never used.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

When the river dries up, these stones start talking.

This ruined castle perched atop a rocky peak is a great place for a hike.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

Tall columns of volcanic basalt make up this improbable-seeming rock formation.

A Baroque mansion with ties to legendary magicians and alchemists.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The 14th-century ruins are said to contain healing powers.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.