This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Secret refuge and museum of the Duke of Florence.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A museum dedicated to antique toys, collectibles, and nostalgia.

New York City's smallest piece of private property.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The remains of a century-old mansion that met a fiery demise years after it was deserted.

A world-class collection of mechanical musical instruments and automata.

An unexpected but incredible collection of wildlife dioramas spanning rainforests, swamps, forests, and plains.

In Edwin Hubble's hometown, a scale model of the groundbreaking telescope that was named in his honor.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This petite park lets visitors see and touch examples of fossilized dinosaur tracks.

A former zoo turned public park, where visitors can hang out in the old animal cages.

No one really knows how these old hobby horses got here, but the herd keeps growing.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

This piece of peacetime naval wreckage memorializes the tragic sinking of the USS Maine--an event which sparked the Spanish-American war.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

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

A collection of full-size movie monsters opened to the public.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

An abandoned asylum incorporated into a college campus.