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

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's largest bullring offers a unique glimpse at architecture and history.

In a town that's had a whole lot of giant chairs this one still stands tall, just not the tallest.

Centuries-old hoofprints and wagon tracks reveal themselves after a good winter storm.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

A delightful but little-known public observatory and planetarium in Munich.

Go surfing on this urban wave, "hacked" by local surfers.

The footprint of a frustrated devil in Munich's Cathedral.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

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

A natural wonder in south Denmark.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Be(w)ar(e) the moat around this historic Czech castle.

Crammed inside this grounded passenger plane is a bar that was once a Communist hang out and is now a ratty relic.

Tiny communists hammer away on the Olomouc Astronomical Clock.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.