📍 Eastern State Penitentiary Operating from 1829 to 1970, Philadelphia's Eastern State Penitentiary set the prison system across the United States for decades. But what started as an innovative penitence system turned into a nightmare for its former inmates, and because of that, the towering structure is known as one of the most haunted places in the United States. Visitors interested in tours of the underside of this historic city can visit the Penitentiary year-round, but right now has its perks with "Halloween Nights." Enjoy beer gardens in the prison grounds, a speakeasy in Al Capone's old cell, terrifying haunted houses (like, so scary they had to discontinue their legendary "Terror Behind the Walls" because people couldn't handle it anymore), live music performances and immersive art installations. It's a great way to get a completely unique Halloween experience while supporting a historic structure that preserves the city's history and actively advocates for prison reform ac...