America's first National Historic Landmark is a 100-foot tall obelisk and gravesite dedicated to the only casualty of the Lewis & Clark Expedition.

This massive piece of artwork weighs more than 250 tons, and was designed as a tribute to the first president of the United Arab Emirates.

The largest source of fossilized insects anywhere.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

You’ve heard of bookworms, but this small sculpture at a university library may be the world’s first bookbee.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

The world's largest collection of preserved trolleybuses.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Catch two 18-foot-tall ranchers mid-brawl as you drive by on Highway 285.

Like the monarchs in its home country, this sculpture keeps losing its head.

This 18-foot-tall public art installation is another of sculptor Thomas Dambo's trolls.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Discarded animal sculptures stand forgotten by an abandoned aquarium and water park in Bosque de Chapultepec.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

This Croatian computer club features such gaming relics as the infamous Virtual Boy and an 8-bit Pacman machine.

This former factory has been transformed into a technicolor wonderland, where dozens of local artists have collaborated to create a real choose-your-own-adventure experience.

A massive playground in the woods of Germany.

This suburban park recalls the history of a famous tavern. Despite the name, it's no ordinary place!

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

By standing on a particular paving stone in the courtyard, you'll hear an echo that shouldn't be.

A subterranean playground in an abandoned slate mine.

Whimsical bronze sculptures of smiling coins and houses await visitors to this park.

One of Frank Lloyd Wright's final works was this UFO church.