The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

World's first "penitentiary," meant to be humane, drove men insane.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

Where the author wrote her beloved "Little House" books.

A layered tribute to the work of mosaicist Isaiah Zagar.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

An entire city block built completely out of petrified wood.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The world's longest known cave system.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.

A preserved factory in the "Home of the Carrousel" is now a museum dedicated to the classic wooden ride.

Toxic waste disaster that founded the Superfund program.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

A collection of unique outdoor sculptures surounded by the beauty of nature.