The first mosque in the world to receive electricity.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

This unique museum focuses on the Siege of Sarajevo through children's eyes.

These Bullet-scarred bunkers are haunting reminders of the Spanish Civil War.

An iconic photograph from the Spanish Civil War saved this shrapnel-scarred historic house from destruction.

Not far from Madrid, a set of perfectly preserved trenches date back to the Spanish Civil War.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

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

A subterranean relic of the Spanish Civil War hides below this picturesque park.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The earliest known map to show America, discovered by accident at a Paris bookshop.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

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

An old, deep well, connected with a miraculous, divine rescue and the patron saint of Madrid.

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Five million people are laid to rest here, more than the population of Madrid itself.

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

This embalmed man is one of the best preserved mummies from the Canary Islands.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.