This historic hotel invented the chocolate brownie.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

A Muppet museum in small-town Mississippi honors the roots of Jim Henson's most beloved creation.

A restored schoolhouse was once a vital part of the Black mill workers community in Arkansas.

Thousands of small machines line the shelves of this personal collection which definitely delivers on its name.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

Mining caused an asbestos emergency in this small town.

These giant metal horses graze on a hilltop near the Montana highway.

After miraculously surviving a giant flood, the 19th-century nut tree and its offspring are protected with their own tiny park.

Colloquially known as "the lynching memorial," this is the United States' first memorial to the victims of racial terror at home.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

An abandoned factory along the Mississippi coated by a giant mural.

An urban forest overtakes what was the greatest failure of utopic urban housing.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

A naturally mummified 2,000-year-old man.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Hear the quietest sound from across the dome.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.