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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

This legendary city has been a tourist attraction for centuries.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The ruined doorway is a portal to the building's turbulent and torturous past.

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

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

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

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

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

There are many Byzantine-era churches still standing in Athens, but this is the only one with a 2,500-year-old column rising through its roof.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

All that is left of this medieval castle is two towers, both of which now display a visible tilt.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.