Enormous lake at the bottom of a unique cave system.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

The final resting place of the Hunkpapa Lakota leader Tatanka Iyotaka, commonly known by the English translation Sitting Bull.

A museum, walk-through diorama, and library nestled under one castle-like roof.

Chef Lawrence West serves up Indian tacos, wojapi, and other Lakota dishes at the brick-and-mortar incarnation of his popular food truck.

Known as "The Hill of the Little Devils."

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

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

The South Carolina competition challenges you to trap as much grits on your body as possible.

A pink and gray pair of pachyderms advertise a fireworks shop.

This tiny chapel next to a highway provides weary travelers a place to rest, pray, or maybe even get married.

A Christian-themed amusement park and complex rocked by scandals.

The final resting place of the Seminole Indian chief who fought against government occupation in Florida.

The only free-standing, vertical sundial in the US was keeping standard time before it was even invented.

A replica of where the Last Supper was held.

Discovered by a soldier during the Revolutionary War, these springs helped create an iconic South Carolina ginger ale.

The record holder for the world’s largest peach.

The world's largest fire hydrant is supposedly tornado-proof.

The only working large-scale tea plantation in the United States.

4,000 monkeys used for medical testing on an island off of South Carolina.

This natural spring not only claims to heal the wounded but it has also been willed to God.