Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

Pittsburgh's literal underground railroad.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

One man's real life disfigurement inspired a lasting local legend surrounding an eerie tunnel.

The graffitied ruins stand hidden within the Pennsylvania woods.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.

A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

This hidden labyrinth offers walkers some brief peace of mind.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

The massive machine creates cracking displays of indoor lightning.

This small-town pizzeria won the Hollywood lottery.

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

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Final resting place of one of the classic authors of horror literature.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

250-year-old farm now features sculptures, a petting zoo and a hippy-bazaar.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.