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.

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

A former military hospital is now used to study and preserve artifacts of the Acropolis.

An important example of architectural history slowly decays in the city center.

Large collection from the 3rd millennium BCE.

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

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

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

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 striking sculpture of Icarus honors Greece's fallen flyers.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A surreal statue honoring Prague's favorite literary son.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

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

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

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