The bears of Bern have been a city highlight for over 500 years.

A fortified city, home to a remaining population of five families

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

The world's largest concentrated solar power plant.

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

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

This striking sculpture of Icarus honors Greece's fallen flyers.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

This Ottoman-era church is hidden amid a busy tourist area.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

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

An ancient Greek monument and a Byzantine church coexist inside this cave.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

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

These caves secretly held national treasures during World War II.

Rest stops along this pathway offer some of the best views of the Acropolis of Athens.

A Byzantine-era church hidden in a wooded area below the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

An early 20th-century school building whose clock tower and carved symbols quietly tell the story of the trades once taught inside.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.