Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

An obscure waterfall that looks like something out of a fantasy novel.

Even Henry David Thoreau found this glacial pothole irresistible.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

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

Treehouse motel and treehouse-building school.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

A once grand hotel is being retaken by the wilderness it once capitalized on.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

The largest permanent Monopoly board makes one of the longest games even bigger.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The subtle science of a master molecular gastronomist.

This former coal gasification plant found a curious second life as a popular public park.

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

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

A 300-ship graveyard, with a few still visible at low tide.

Stay in a room with a view... of the bottom of the ocean.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.