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

Enormous lake at the bottom of a unique cave system.

Oldest synagogue in the United States.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

This large midwestern cavern features impressive rock formations and an underground waterfall.

Half of a waterfall goes into the river while the other half seems to disappear.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

Two dozen rescued bears roam (mostly) free at the largest bear ranch in the U.S.

This shallow cave got its name from copious amount of human bones found inside.

Ancient petroglyphs discovered only after a massive fire swept across Michigan in the 1880s.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

148 feet long and in the middle of a verdant forest.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The largest land animal skull ever discovered.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

This elegant arc of a waterfall marks a religious turning point.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The oldest university museum west of the Mississippi retains its 19th century feel.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

This zombie-themed restaurant stands out in the heart of corn country.

This small Arkansas town once had a close encounter with the Beatles, and are determined never to let anyone forget that. Ever.

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

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