Enormous lake at the bottom of a unique cave system.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

The largest self-built castle in the U.S., six decades in the making.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

This museum offers an actual time machine back through Colorado's past.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This hot dog-shaped diner has moved all around Colorado, but has never been to New York.

The highest bridge in America was built for an almost unnervingly small amount of money.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

When ecosystems collide in the arid Southwest.

These aggressively sustainable art homes look like something out of 1970's science fiction.

One man’s passion for gas stations is on display along the Rio Grande in northern New Mexico.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

A famous flea market artist's studio that's full of odds and ends.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

One part local history, 99 parts gruesome haunted house.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.