A haven for book enthusiasts across the street from Retiro Park.

A pair of gigantic baby heads greet passengers at Atocha Station.

A 19th-century architectural masterpiece with ties to Gustave Eiffel.

The world's largest ship graveyard is the product of decades of corruption.

The largest camel market in West Africa

Thousands of colorful pirogues showcase ingenious craftsmanship at the largest fishermen port in Nouakchott.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

This tiny, tranquil Senegalese island serves as a powerful symbol of the Atlantic slave trade.

Both an engineering feat and a monument to bad colonial politics.

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

The second largest monolith in the world was once betrayed by its lover, Ben Aicha.

An island made out of shells, including a cemetery.

An architectural relic that survived the hands of time.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

This remarkably well-preserved mosque stands amid an 11th-century caravansary.

A geological bull's-eye visible from outer space.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Founded in 670, this ancient mosque is an architectural time portal.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Part shoe store, part sociopolitical art gallery, part zoo.

The lost library of Alexandria, revived as a spearhead of cultural preservation.

This memorial park is also the original site of Queen Cleopatra’s Caesareum, whose pillars now stand in London and New York.