This is one haunted house that's so scary you have to sign a waiver before you can go through.

The 13th Floor Haunted House in Denver is one of the most popular and scariest Halloween attractions in Colorado. The website even warns the event may be too intense for kids 12 and under. According to the attraction's websiteUSA Today calls it one of the "top 5 terrifying haunted houses in the USA."

It must be a terrifying experience since the website tells you what you need to do in case you "get too scared."

Not only does the 13th Floor offer the usual frightening features of a typical haunted house, for an additional charge you can enjoy interactive experiences like escape rooms, a dark maze, and ax throwing.

The base admission price, depending on which day you go, ranges from $19.99 to $32.99. They offer upgrades to a Fast Pass ticket as well as a Skip the Line Ticket for those that want to spend the extra money.

The 13th Floor Haunted House is located at 3400 East 52nd Avenue in Denver. Paid and free parking are available around the haunted house.