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

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Mysterious library of an infamous financier and spiritual seeker.

Victorian-era Egyptomania left its mark on this Nashville landmark.

Mass graves and Victorian monuments mark the history of Memphis in this 19th century cemetery.

This mansion turned restaurant was once a pitstop for Al Capone during his travels.

Crumbling Kennedys and a decaying Tecumseh are just some of the haunting remains of one man's cement art trail.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

This defunct, fortress-like prison has been the setting for several movies.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

The small cave that housed Tennessee's "first citizen."

This former maximum-security prison is creepy, sobering, and supposedly haunted.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

Elvis's own personal tropical hideaway.

The first full-scale tunnel built in America is short but scenic.

An abandoned town is hidden in Great Smoky Mountains National Park.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Mile-long cave system near Great Smoky Mountains.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.