A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Exact replica of the ancient monument, but much, much lighter.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

One of the last free public hot springs is decorated with hippie art.

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

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

The drama of nature in full effect in this Nevada State Park.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

A bigger-than-life pun that has become a beacon of altruism.

Friction between grains of sand cause a curious "singing" sound.

Abandoned concert venue legendary for its rock counterculture.

This historic national park is covered in the stunning ruins of red rock pueblos.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

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

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

This collection of Japanese luck idols beckons visitors with over 2,000 waving paws.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

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

This semi-hidden Manhattan restaurant is based out of a loading dock.