A geological oddity formed by two rivers carving out a mass of limestone on both sides.

European castle ruins in an American state park are actually the product of death and grief.

Curious cave that stays a cool 56 degrees all year long.

Like Stonehenge, but with boats and oodles more charm.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

This historic cliffside mansion uses a natural cave for air conditioning.

This small town bank is very aware of its name thank you very much.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

The Vatican of the movie industry turned into an actual church.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

One of the world's earliest skyscrapers.

This unassuming riverbank is Missouri’s first designated site in the National Underground Railroad Network to Freedom.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A public art jibe at one of the United States’ oldest and longest-serving senators.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Gambling, boozing, and yodeling animals cover the walls of this dive bar cum natural history museum.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.