The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A toxic ghost town sitting atop a massive coal fire.

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

A one-of-a-kind collection of a unique medium.

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

One man's homage to the sun continues to grow like a glass fractal.

A winding path built in secret on the edge of the continent.

This shop specializes in oddities and Victorian-inspired wonders.

America's most famous piece of self-built architecture.

A walk through the historic city center, under the streets of Seattle.

Resting place of Hollywood's immortals is also site of summer film screenings.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Medical and zoological curiosities for sale.

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

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Try not to get slimed in Tribeca.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.