These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

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

A collection of over 15,000 zines works to preserve DIY publishing culture.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

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

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

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

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

When ecosystems collide in the arid Southwest.

This naturally-sourced hot spring is now home to a clothing-optional resort.

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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.