This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

A historic hydroelectric power plant serves as the unusual backdrop for a public park.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

This fountain was designed to honor the man who helped bring water to Barcelona.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

An iconic work of public art that lights up the downtown area.

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.

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

A beautiful but toxic fountain of mercury.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Dedicated to a young woman who broke gender barriers at the University of Madrid.

An automaton perched above an classic clock and watch store

Just like in Hollywood, Madrid has also a forgotten walk of fame.

The remains of a convent turned military barrack in the heart of Madrid.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

An ancient Egyptian temple in the middle of Madrid, Spain.