A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

A modern zoetrope on the New York City subway.

“Invented in Key West, Perfected in Brooklyn."

Sniff the Titan Arum's rotting flesh.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

This innocent-looking townhome is actually a subway exit.

Ride the subways of yesteryear.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

19th century cemetery hidden in Brooklyn's Prospect Park.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

A former waterfront market is now in the center of town due to some interesting Boston engineering.

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

The ballpark in "Pigtown" where the Brooklyn Dodgers made their name was replaced with a huge apartment complex.

A cruise terminal that changes the atmosphere of Red Hook's industrial waterfront.

One of the most scenic falls in Massachusetts has a history of death and grim legend.