A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Turntable anonymously received orphans, alms, and groceries.

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

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.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Barça football fans might see the insignia hidden in a church window as a divine sign.

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.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

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

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A lush indoor jungle fills this bustling Madrid transportation hub.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

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

A controversial art piece that harkens back to local folklore.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

There aren't too many operational funiculars around, but Pittsburgh has two!

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.