A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

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.

Stone age urban planning.

A giant portrait of an ancient king looms over the river.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

An abandoned monument remembering the "Pančevo Holocaust" now stands as a shadow of its former self.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

Cave shrine on Monte Pellegrino.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Haunting graffiti left by prisoners of the Spanish Inquisition.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A pocket of jungle amidst urban expansion in Panama.

A huge, bustling local market in Panama City.

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

A museum of memories in what was once one of the most violent cities in the world.

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

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

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

An ancient city hidden in the heart of the Sierra Nevada mountains.

In the middle of one of South America's most historic walled cities lies a bar with an enormous collection of Soviet memorabilia.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.