A seaside castle complex that stood through centuries of conquests.

Hideout of thieves, monks, and goat-footed gods.

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

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

This famous archeological mystery may be an ancient example of movable type.

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

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 beehive tomb built for royalty sat hidden for over 3,000 years.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

Step inside an ancient beehive tomb built for a mysterious cult hero.

Built by the Ancient Greeks, this chariot bridge is still in use today.

This legendary city has been a tourist attraction for centuries.

Modernist design and funerary customs meet Spartan traditions in this one-of-a-kind graveyard.

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

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

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

The final resting place of the great navigator, or maybe his brother.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.