This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The world's largest reflecting pool is just two centimeters deep.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Traditional 11th-century outdoor tannery.

Crumbling necropolis set high above Fez.

The oldest known university in the world is in Fez, Morocco.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

Single runway interrupted by a busy road that cuts across its middle.

The world's most elegant power lines.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborate tile work in this railway station tells the story of Portugal.

A cluster of granite granaries perched on stilts.

A submerged village appears when dam levels drop.

A unique seaside cave where Aleister Crowley faked his own death.

One of the largest Roman settlements in Portugal.

An ancient tomb that still stands in Portugal.

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

A deadly ancient portal to the underworld.

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

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