A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

The Andean town where every single building is decorated with a brightly colored frieze.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The (usually) serene burial place of the world's most notorious drug lord.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

Three hundred illuminated pillars form an “artificial forest” in Medellín.

Two identical statues by Fernando Botero, one blown to pieces in a terrorist bombing, the other donated as a gift for peace.

Home to 23 voluptuous and instantly lovable sculptures by one of Latin America's most celebrated artists.

A collection of art from Bulgaria's time as a communist state.

A vast Communist-era exhibition space in the Bulgarian capital.

A striking symbol of the Bulgarian capital.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

Structure built from the skulls of vanquished foes.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Near Belgrade, an ancient-looking sarcophagus serves as a World War I monument.

A pair of connected skyscrapers form this symbolic gateway.

Two buildings named after their windows that make it look like a sea of television sets plastered to a wall.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.