A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

Cryptic messages embedded in the New York City sidewalk.

On this island, you suck away your garbage via an elaborate pneumatic tube system.

Visit the monolithic tomb of America's most famous general.

Try not to get slimed in Tribeca.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

An artist's cute bronze subway sculptures belie his violent artistic past.

A monument celebrating the idea of reaching inaccessible places.

A unique sculpture park that specializes in the huge and bizarre.

One of the world's largest model railroads is a mind-boggling achievement.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

World's first "penitentiary," meant to be humane, drove men insane.

The oldest continuously inhabited street in America.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A museum dedicated to the history and exploration of both popular music and science fiction.

The second oldest continuously operating bar in Louisiana.

Mysterious rocks that ring musically when struck.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

An eccentric playboy's astounding natural history collection.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Tucked in the back of this amazing antique store is an important piece of medical history.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.