The Habsburgs' royal collections of art and wonders.

For over 300 years this little carving has been the city’s good luck charm.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

Spain's stunning solar energy plant.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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 is expected to be completed in 2026—a century after the death of its architect.

Retirement home where the actress who played the Wicked Witch of the West passed away.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

This tribute to the founding father of the American dictionary originally contained a spelling error.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A cluttered and astounding collection of antiquities and curiosities.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This demon atop the Notre-Dame de Paris looks utterly bored.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

The celebrated eyesore created by starry-eyed sweethearts.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.