A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A gigantic teapot sitting on top of a parking garage in the center of Utrecht.

Atop this former dutch railway office sits an interstellar work of art.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This striking structure, with balconies jutting out like hedgehog spines, combine cutting-edge design with a playful approach to light and space.

Copenhagen's "other" little mermaid marks the historic location of past sea maid sightings.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

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

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A mocking tribute to the past and modern leadership of Prague.

This spooky statue sits outside a famous Prague theater.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

The ancient latrines of the Greeks, in all their public glory.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.