Enormous lake at the bottom of a unique cave system.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This labyrinthine resting place of Black American leaders has been reclaimed by nature.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

A whopping 14,000 copper coins cover this miniature fighter jet.

This museum sits on the site of a decommissioned military communications base.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

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.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

The remains of one of the last mining camps developed on the New River.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

The only Florida state park with publicly accessible caves.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.