The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

These rusting, skeletal structures are monolithic monuments to Glasgow's industrial past

This two-legged horse statue celebrates a beloved cartoonist and his quirky characters.

The abandoned transportation hub hides within the Glasgow attraction it once served.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Hidden in a Scotland museum is a copse of extinct tree stumps.

The little-known second castle that William the Conqueror built in York.

The celebrated eyesore created by starry-eyed sweethearts.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

Cold war icon and onetime "hole" in the iron curtain.

A fascinating insight into daily life in the Eastern Bloc.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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.

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

Huge winged monument in the United Kingdom.

The sign at the garden gate reads: "These Plants Can Kill."

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

These planks were originally installed to hold the dead.