One of America's first dinosaur parks gives a window into Depression-era paleontology.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

The mayor made the declaration in 2004.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

The site of the Wellington avalanche, one of the America's worst railroad disasters.

A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

One man's ambition created this psychedelic log home.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

This historic Idaho island is home to a strange timeshare museum, a homemade mini-golf course, and an outhouse named Aunt Fanny.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

A wild west land agreement was etched right onto this historic Idaho stone.

A beautiful geyser under environmental threat.

A speakeasy takes on Chicago's drinking culture.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

Native Americans built this circle of stones, which was used to predict astronomical events.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

The world's longest known cave system.

Vikings and Evangelicals have both had a hand in this replica medieval church.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.