Resonant stone, that has been played since prehistoric times.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

An ancient Egyptian temple in the middle of Madrid, Spain.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The colonial city's social history is reflected in its fanciful door knockers.

In the heart of Medellín, an artsy urban complex sets the stage for demonstrations and protests.

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

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.

It's just another skyscraper, but it's shaped like '90s cell phone.

Pablo Neruda's custom-built lover's nest was made to remind him of the sea and named after his mistress' hair.

A museum founded to reflect on and remember the human rights abuses under Chilean dictator Augusto Pinochet.

A bright little alley in La Boca is a part of tango history.

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

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Bridge that died in war and was resurected.

The first mosque in the world to receive electricity.