A restaurant and observation deck built in a unique broadcasting antenna.

A towering monument to war, located on a beautifully peaceful hill.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

Metro station with a claim to rock n' roll fame.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

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

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

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.

A spectacular cave and a beguiling lake.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

The hallucinogenic center of the ancient world.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

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

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

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

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

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

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.