The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

A celebrity from the late Cretaceous period.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This quirky curiosity shop takes its cues from the world's bazaars.

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

A melancholy guardian doubles as a judicious godmother to this small town cemetery.

This California artist's front yard acts as a gallery for his unique, scrap metal animal sculptures.

This abandoned train tunnel has been the subject of countless ghost stories for years.

Home of a 28-foot tall stalagmite known as the War Club.

Thousands of jack o'lanterns light up Halloween at this historic West Virginia home.

Winding country roads in eastern West Virginia lead to an extraordinary place populated by fiberglass giants.

This local gem houses the largest collection of pre-Raphaelite paintings outside of the U.K.

A sculptural commentary on capitalism pokes up from the East River.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

This abandoned subway station can still be seen on regular commuter trips.

New York's oldest and possibly grandest keeper of books.