The collar worn by a fourth-century saint resides in this church, and is still used for blessings to this day.

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This famous archeological mystery may be an ancient example of movable type.

This elaborate temple was built around one of the Buddha's teeth.

A 16th-century Andalusian palace.

The world's largest wooden structure.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

The stunning interior of this Gothic church is covered in ornate gold details.

One of downtown Berlin's last reminders of its Communist past.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.