A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

A sculpture for the sun and stars, created by Nancy Holt.

A bronze sculpture of Lenin’s likeness outside Havana surrounded by 12 human figures in solidarity with the Bolshevik Revolution.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

A serpentine highway twists and turns over the treacherous Norwegian Sea.