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

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

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A large stone map of Arkansas awaits visitors to its highest point.

This quirky Arkansas wax museum does not shy away from the macabre and the grotesque.

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

The only diamond mine in the world where you can keep what you find.

A popular rock that acted as a waymarker for American pioneers.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

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

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.

A beautiful geyser under environmental threat.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

Abandoned silver mine strewn with wrecked and twisted structures.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

The famous aviator's final resting place is a study in natural beauty.

A controversial memorial at the place where Captain Cook met his violent end.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.