Before his concert on Saturday, Justin Bieber, girlfriend Selena Gomez, Cody Simpson, director Alfredo Flores and a few other friends visited Goretorium in Las Vegas.
Bieber, Gomez and friends met up with creator Eli Roth at 1:30 p.m. for a private tour of the frightening venue.
Roth, who is also the brains behind horror films Hostel and Cabin Fever, created Goretorium as a self-guided multi-level maze of horrors.
The group started off in the lobby of the mythical Delmont hotel but as they toured the space, more and more gruesome sights were revealed.
"Once the group made it out 'alive' they toured the Goretorium retail shop, which is filled with horror props," an onlooker tells PEOPLE.
Perhaps the fright Bieber experienced were responsible for him getting sick on stage while performing later that night.
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