In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

Happen to come across a dead eagle? Send it to America's official dead eagle warehouse.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Hot Doug's "Hot Dog" Stand.

Once known as the Illinois Asylum for the Incurable Insane.

Moving, mind-blowing metal sculpture work of an outsider artist.

In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

A century-old network of freight tunnels underneath the city's historic business district.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

An exhibit of items from the mental institution where Mary Todd Lincoln lived after her son conspired to have her committed.

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

Its eclectic exhibits range from the world’s first motorcycle to Luke Skywalker’s Land Speeder.

Julia Buccola Petta's body was peculiarly well-preserved when it was exhumed six years after her death.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

Roses and other fascinating flora fill this garden built to commemorate Britain's immortal Bard.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

This cemetery is all that remains of a school for "wayward" girls.

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.