Art in the form of a winding, man made crack in stone.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

A hand-built folk art installation covered with messages of God's love.

Series of storm drains connected to a dark urban legend.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

Constructed in the 1920s, this former pencil factory is now an office building.

A 9-story, poured concrete structure which was used as a glue factory with an indelible smell.

Queen Anne style apartment house built in 1886.

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

Nondescript building owned by ExxonMobil working on siphoning Greenpoint Oil Spill out of the ground.

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

America's post-nuclear-attack chambers of Congress.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

A modern mechanical planetary system, part of a 10,000 year clock.

A monumental cross hides in the trees in Golden Gate Park.

Hollowed out cedar log tubs set in an ancient towering forest.

An enormous park-like oasis, full of famous Chicagoans' graves.

A New England curiosity cabinet, one hundred years on.

Mysterious rocks that ring musically when struck.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

The Decoy Capital of the World.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.