3,000 market stands in five former Zeppelin hangars.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

An underground city of salt.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

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

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

18th century opera in its original splendor.

A miniature train-ride through Slovenia's largest cave system.

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

The summer tourists on these cliffs are thousands of seabirds.

Climb right into the heart of this colorful Iceland volcano.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Two monstrous faces loom over a village in Czechia.