Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

The only surviving prototype of Buckminster Fuller's revolutionary car.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

It's good luck to be mocked by this monkey.

Museum dedicated to the art of cutting and polishing stones.

A town honors its legacy of traditional American Indian pipe carving with one gigantic pipe.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Neo-cave art on the macro scale.

Prehistoric history as seen through the lens of an outsider artist.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

His music once banned in Communist Cuba, John Lennon is now immortalized in bronze by Castro, who considers Lennon a "fellow dreamer."

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

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

Elaborate drama imparts an appreciation for 19th century hardships.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.