Made up of 3,200 recycled glass bottles, this tree pays homage to Asturia's love of cider.

This modern sculpture looks out over the sea and amplifies sound from the inside.

This floating sculpture of ice is a poignant reminder of nature's power.

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

This bridge was constructed from the rubble of the infamous Bastille.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

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

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

These mosaics were created more than half a millennium ago and feature various animals.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

Beloved children's TV characters freckle the German city's streets.

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.

Take a walk in a recreation of ancient Rome.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

This mine is home to the largest man-made hole in Europe.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This baroque palace displays an impressive collection of taxidermy, art, and rare objects from the days of courtly hunting.

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

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

A ruined castle stands atop a hill surrounded by dragon lore.

Fantastic views and thousands of love locks.