Circus of Horrors. Circus of Horrors is a haunted house in Las Vegas, Nevada. It is on Smokeranch and Rainbow Blvd. It is next to two ther haunted houses, Gates of Hell 666 and Castle Vampire. It was opened in September 2006. Oh no! This Halloween article has serious gaps or missing content for the topic. Did the monsters take it? How scary! Can you help fix it? You go that way, and I'll go this way... Retrieved from "https://halloween.fandom.com/wiki/Circus_of_Horrors?oldid=15788" Categories: Article stubs Haunted houses Community content is available under CC-BY-SA unless otherwise noted.