Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

A 16th-century Andalusian palace.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

The final resting place of the great navigator, or maybe his brother.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Commonly acknowledged as the only public monument to the Devil himself.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Walk the whole Mississippi River!

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.