Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

A jewel of early electric boosterism once again charms Connecticut's historic "Hat City."

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

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

The first pet cemetery in the United States.

Glacial erratic or man-made dolmen? It probably wasn't druids.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

This abandoned ironworks was once the most important military supplier in America.

What appears to be an act of fruit vandalism is actually a cultural statement.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

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

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Home of Philip Johnson, one of the 20th century's most influential architects.

Reforestation in action is the main attraction in this abandoned quarry.

Haunted Victorian house that inspired a legendary "Ghostbusters" court ruling.

Astonishing collection of helmets, scientific instruments, and medical models.

Protecting the future of some of the rarest and most misunderstood mammals of North America.