One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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

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.

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

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

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

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

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

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

The beams of the New College, Oxford dining hall come with an amazing story.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This 11th century tower is said to be the oldest building in Oxford.

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

Hidden in plain sight, this creepy sculpture watches from above.

Home to the most complete dodo remains known - one head, and one foot.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

One of Europe's oldest libraries.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

The large collection of pre-Columbian pottery might make you blush.

The little bear in the "funny kind of hat" has made his way from London back to Peru.