An unlikely neo-Gothic castle in the Paraguayan countryside.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

This whimsical stacked cabin looks like something out of a children's book.

This iconic science fiction house still looks like something from the future.

A volcanic fissure over two miles long and up to 70 feet deep.

At the base of Steens Mountain resides an otherworldly desert.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

Secluded springs in the Rio Grande Gorge offer hot bathing beside the haunted ruins of a stagecoach stop.

For 60 years, skiers have calmed their nerves with cocktails hidden along these slopes.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

See six states, pickled freaks, rocks, and antiques.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

A prehistoric rock shelter that's literally in someone's backyard.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

Toss a Frisbee through the ruins of this Colorado gold mining town.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

Paleoamericans built these ancient walls high in the Colorado Rockies as part of an extensive hunting system.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.