Possibly the world's largest coin stands just outside of a Canadian science center.

A mysterious lake provides fresh water without any source, somehow restoring itself from atop its mountaintop perch.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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

The celebrated eyesore created by starry-eyed sweethearts.

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

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

Cliffside houses provide a spectacular view from their perch above the valley.

Commonly acknowledged as the only public monument to the Devil himself.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The modern birthplace of Irish freedom.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

Golden Gate Park's historic collection of plants.

The remains of a 12th-century chapter house in Golden Gate Park.

It's not your typical library, memorial, or book store.

Quite simply the largest tree in the world (by volume).

This "Palace of Purification" has made many film appearances as a dark and sinister headquarters.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This massive, ancient stone was disassembled and then put back together again.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Northern Ireland's Brobdingnagian stepping stones.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.