A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A semi-scholarly approach to sex.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A terrific purveyor of natural history objects and curios.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

A long abandoned hospital building on the outskirts of NYC.

The oldest continuously operating farm in New York State.

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

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

The loneliest island in New York.

An unrealized dream to wirelessly electrify the entire Earth.

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

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

A mysterious air force base built to resemble a Long Island fishing village.

Hut with supplies for shipwreck survivors.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

An enormous, inside-out glass globe built in 1935.

America's oldest archaeological site or a muddled case of wishful thinking.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.