Tiny historical streetcars wind through a small scale version of Crescent City in this whimsical train garden.

These curious caverns have been home to mushrooms, gangsters, and disco.

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.

Home to fantastic views and ancient graves.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

These ruins are all that's left of the former Alabama State Capitol.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

A short boardwalk through a swamp leads to the spot from which the Louisiana Purchase was surveyed.

One of the most acclaimed eateries in Arkansas is a two-table diner on the ground floor of a family home.

The seventh largest spring in the world.

An abandoned early-20th-century boomtown sits within the Calico Rock city limits.

There are no bodies inside these stone coffins. And there never were.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

The highest waterfall between the Rockies and the Appalachian Mountains.

This century-old roadside attraction is full of bizarre rock formations.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

From a canyon-like gorge, more than 20 million gallons of water emerge every day, while a smaller spring drips down, creating the illusion of an endless, gentle waterfall.

Away from the crowds of fishing enthusiasts, take a hike deep into the woods and journey into an eerie darkness.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

One of the largest trees of its kind in California.

An inconspicuous footbridge beloved by San Diego locals.

A hulking remnant of Alaska's industrial gold mining boom in the 1920s.