Former hotel turned into haunted playground.

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

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This shop for all your super spy needs hides an educational secret.

When in Idaho, sleep in a giant potato.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

Despite his legacy of work in Spain, Cuba, and Florida, the larger-than-life writer's grave is a simple affair tucked in an Idaho cemetery.

This museum glorifies the humble potato.

Death comes to anyone who dares to touch this concrete column.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Two flush headstones mark the only known graves to be embedded in an airport runway.

Coca Cola may be "the real thing" but its inventor, buried at this Georgia gravesite, called it a "valuable brain tonic."

This bar hosts an ever-evolving napkin art installation devoted to an American president.

A mysterious inscription may hold a clue about the "Lost Colony" of Roanoke.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

This kitschy tavern is also home to rare early editions of "Treasure Island."

This stone is a marker of one millionaire's personal vendetta against gravity.

"X" marks the spot of an echo chamber in the middle of a plaza.

This 13-foot smiling peanut in Georgia helped Jimmy Carter win the 1976 presidential election.

Suspended above the ground in a thicket of towering Georgia trees is a modern architectural wonder.