An ancient forest of the Paleocene Age turned to stone.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

A tower devoted to — and modeled after — the Divine Comedy.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This stunning mass of ice spans 121 square miles and is still growing.

An Ethiopian cloud forest protects some of the last wild arabica plants.

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

Traditional 11th-century outdoor tannery.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

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.

Founded as a refugee camp, now a popular tourist spot.

Morocco's Argania trees are infested with nut-hungry goats.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

One part local history, 99 parts gruesome haunted house.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The stone sculpture of an Ottoman soldier is an homage to a lost Providence landmark.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.