"Medieval" castle built in the mid-20th century by one family.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

An artificial crater field that trained astronauts for lunar exploration.

A motel dedicated to Southwestern nostalgia.

A cave's rare beauty held a cavernous secret hidden underground.

An operating lighthouse from the 1860s.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

Relive a Polish uprising via an enormous, century-old cyclorama.

A sunken idol welcomes parishioners to Davy Jones' Locker.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A perfectly running 230-year-old silver automaton and music box.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

One of the largest, oldest, darkest, quietest motel rooms in the world.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

These quaint French houses dangle precariously over a precipice.

The remains of an entire Roman city can be explored in this interactive museum.

A curious structure built just for the birds.

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

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

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