Etchings in a pile of boulders on the Long Island Sound are a monument to vanquished native peoples.

A large camera obscura, constructed entirely from digitally fabricated components.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

The first commercial nuclear power plant constructed on Long Island.

An unrealized dream to wirelessly electrify the entire Earth.

This forgotten graveyard in rural New York State once served a pioneering hospital.

Now a retreat center for the faithful, it once provided training for clergy—but it began as a farm owned by a famed financier and his opera singer wife, who built a surprise in the backyard.

The poet Walt Whitman was a frequent visitor to this spot, the highest on Long Island.

The famed poet was born in 1819 in a farmhouse built by his father.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

The final resting place of a circus performer who went by the pseudonym "General Tom Thumb."

Connecticut's shot tower is near the end of its life.

The once abandoned ruins of a Victorian beachside amusement park are now back in working order.

The intriguing personal collection of a professional demon-chaser.

This large boulder was used as a lookout point by Revolutionary War militiamen.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

This enormous abandoned factory is now a makeshift graffiti gallery.

A vast collection of rare books, manuscripts & extraordinary objects illustrating the history of medicine.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

One of America's oldest private membership libraries was long one of New Haven's best kept secrets.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.