A masterpiece of Rationalist architecture in the center of Madrid with lizards on it.

This site is both a remarkable reminder of the town's mining history and a fantastic government blooper.

This enchanting green space houses a labyrinth lined with toxic plants.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

A miniature city, once ruled by the Queen of the Netherlands.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

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

This ancient city - home to nine civilizations - is soon to be buried under 200 feet of water.

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

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

The best-preserved ancient theater in the world.

Mausoleum and Holy Seat of Antiochus I of Commagene.

A Turkish monastery tucked into a cliff wall.

Flames have been burning within this mountain for more than 2,500 years.

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

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins top white travertine terraces formed by ancient hot springs.

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

This 17th-century structure is a beautiful testimony to traditional Persian architecture

This 12,000 year old Iranian cave village has been continuously inhabited for over 3,000 years.

The hottest, driest, and most scenic desert on Earth.

17th century mosque for Shah Abbas' harem.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.