Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

Final resting place of the immigrant who brought artificial seltzer water to America.

A world-class collection of mechanical musical instruments and automata.

Marie told fortunes from her small stand on the Boardwalk for decades, including to a young Bruce Springsteen who would busk outside her booth.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Arlington Cemetery exhibit dedicated to death and grieving.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

World Trade Center memorial likened to a woman's sexual organ.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

A historic grist mill and active sluice on the Black River.

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

A completely round house designed for the Atomic Age.

Mysterious rocks that ring musically when struck.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A recently abandoned psych ward at the end of Sanatorium Road.

Once America's longest-manned military fort, now an abandoned hulk.

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

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

Featuring the the longest lift span of any vertical-lift bridge in the world.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.