Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

340 bicycles, 65 feet high.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

An overlooked and unassuming engineering marvel.

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

This world-class vineyard has a peculiar collection of contemporary sculptures scattered across the property.

The largest drain hole in the world.

The rusting remains of the largest assembled WWII fleet on the West Coast.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

With the touch of a button, you can read a randomly selected short story.

A 1920s home transformed into an immersive art experience, where every room is a portal to another realm.

Two pillars set 10 paces apart commemorate the "last notable American duel."

The final resting place of the Emperor of the United States and Protector of Mexico.

A vast city of the dead, where the deceased outnumber the living by more than a million.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

The abandoned personal amusement park of the King of Pop.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

Explore more than 130,000 new and used books in the "world's largest outdoor bookstore."

This Stonehenge-inspired solar calendar stands alongside a landfill, in the middle of the Nevada desert.

This sculpture presents commentary on a life in pursuit of profits.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

A beautiful final resting place for some of the noteworthy deceased.