Just in time for Halloween, Hauntdworld.com has released its 2011 list of the Top 13 Best Haunted Attractions in the United States.

And topping the list? A pair of haunted attractions in suburban Philadelphia: The Bates Motel and Pennhurst Asylum, both operated by the same company.

Here's what Hauntdworld.com has to say about the best haunts in the U.S.:

1. Bates Motel & Haunted Hayride and Pennhurst Asylum Haunted Attraction in Philadelphia, PA Pennsylvania: The Bates Motel Haunted House & Hayride is a unique haunted attraction for several reasons: The Haunted Hayride is located deep in a 200-year-old forest full of overgrown trees creating the ultimate dark trail even during a full moon. This puts customers on edge even before ever entering the first hayride scene. Combined with a digital custom soundtrack, pyrotechnics and continuous scares throughout the ride, this hayride attraction is sure to create the ultimate haunting experience of your life! To read a more detailed article about this attraction, visit their website at www.TheBatesMotel.com. Additionally, The Pennhurst Asylum is one of the scariest haunted attraction sites in the world, mostly due to the setting of this haunt. It's located in a 100-year-old, abandoned mental institute. The building itself will instill real fear and true horror in anyone. The Asylum has been investigated by professional ghost hunters and featured on Ghost Adventures and Ghost Hunters several times. This attraction is truly haunted. To read a more detailed article about this real haunted house visit their website at www.PennhurstAsylum.com. Bates Motel and Pennhurst Asylum are owned and operated by the same company and are within a short drive of each other. These have to be number one on our list for locations to get scared this Halloween.

To review all 13 haunted attractions, visit Hauntworld.com