According to USA Today, the 13th Floor Haunted House in Denver is one of the 5 best haunted houses in the country. However, nowadays, the 13th Floor seems to be blown out of proportion by its reputation and hampered by it. Even on a Monday night, groups spend only a fifth of the time inside the attraction as they do waiting in line, and parking costs just as much as an extra ticket as the streets were lined with parked cars for three blocks in every direction. That being said, should you go to this event, be sure to arrive on time or even early to your scheduled ticket time to save yourself the one to two hours spent in line. Also, be sure to have $20 cash for parking and a good deal of patience to work through the crowds, traffic, and remarkably condescending and aggressive lot attendants.