This Luxembourg cave is covered in cryptic looking marks left by mining activity.

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

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

Preserved baths in a Victorian-era spa town frequented by the most famous people of its day.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

These ruins of Francis Bacon's once-magnificent manor are hidden in the English countryside.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This romantic, decaying 13th-century ruin on the edge of Sherwood Forest is reputedly one of England's most haunted places.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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 was finally completed in 2026—a century after the death of its architect.

Breathtaking and huge 430 year old maps of Italy.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.