A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

A medical facility that has been kept frozen in time.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This small museum is an eccentric shrine to boyhood in the 1960s.

Come for the gun-toting hillbilly madman, stay for the ice-cream loving basketball bears.

Restaurant in a 1741 farmhouse that touts the story of its haunting on its menus.

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

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

Birthplace of America's first documented serial killer.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

Museum dedicated to the struggles of the disabled.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

The absurd creation is a compulsory destination for selfies in Buffalo.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

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

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

The first and only carousel with a lineup entirely of insects.

The famous author's cottage hideaway.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.