The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Hidden behind Lincoln's head is a chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

See massive fossils that are over 200 million years old in northeastern Arizona.

Whether or not you take the 72-ounce steak challenge, there’s plenty of history, fun and Texas-style food at this legendary stop along Route 66.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

A unique home built by Andrew Jackson Caldwell that also served as a military hospital.

Prehistoric animals decorate this popular outdoor park.

Amazing taxidermy dioramas from the 1960s in a cement building meant to look like an ice cave.

One of the few surviving "Wigwam"-themed motels.

The world's longest known cave system.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

A delightful park featuring homemade scale replicas of dinosaurs, tucked away in the Tennessee mountains.