Climb inside an iron crystal magnified 165 billion times its normal size.

A geological oddity topped with a 2,000-year-old pagan temple.

The second largest in the world, this massive underground void has its own subway.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A museum glorifying the life of Stalin, located in the city of his birth.

A whimsical bridge adorned with decorative dragons.

The prototype for all Nazi concentration camps.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Baroque celebration of the end of the Great Plague of Vienna.

An ancient necropolis of magnificent tombs.

For nearly 2,000 years this church has been waging war on local snakes by importing cats.

This 700-year-old Cyprus castle is the birthplace of the world's oldest wine, said to be toasted by Richard the Lionheart at his wedding.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

This stunning concert hall has become a symbol of Iceland's national recovery.

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Walk in the footsteps of the gods and straddle two tectonic plates.