The first integrated firehouse in Atlanta houses a museum on the history of desegregation in the city's fire department.

Healing Springs that once ran red with soldiers' blood.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

Tour the sci-fi-esque reality of governmental disease management.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

This enormous censer uses a pulley system installed over 400 years ago.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

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.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

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.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A bypass decorated with large wooden troll carvings.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.