Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A crumbling cathedral condemned by an earthquake.

The youngest volcano in Central America.

These roaring primates were considered a divine creature in the cosmology of the Maya.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

A colossal statue with a controversial past, forgotten for more than 30 years.

The enormous smoke hides within a little known, semi-secret exhibit inside Havana's Morro Castle Historic Park.

Neo-cave art on the macro scale.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

The house that birthed The Old Man and The Sea is now a museum devoted to the old man who wrote it.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

These towering cliffs jut dramatically from the middle of a barren desert.

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

This futuristic building is yet another architectural wonder in Dubai.

The building is a gigantic piece of art inspired by the shape of a desert rose.