This abandoned artificial island off the coast of New York City is now home to dozens of harbor seals.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

An abandoned gun-funded 19th century utopia.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

A wunderkammer hidden on the top floor of the Hartford statehouse.

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

A rare view of a preserved Victorian science museum.

The bears may be gone, but their old cages can still be found.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The Boston square dedicated to the dark poet who was born nearby.

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

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

A mental health hospital dating back more than 139 years, now features a museum.

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

A downtown park built on top of unclaimed graves.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

Even in death, he's still your huckleberry.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

The largest self-built castle in the U.S., six decades in the making.