A bit of retro transportation flair preserved in the world's largest department store.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

This influential Renaissance-era library was once the haunt of kings and monks.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

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

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

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.

The world's largest wooden structure.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

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

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.