From a Facebook event:
Join us the 27th-28th of October in the only good haunted house that Moscow has to offer. Following in the footsteps of Moscow Massacre, this years house will push the envelope of what the audience can handle. Set during the second World War, you will encounter the horrors of conflict and the atrocities of the Nazi party. There are no limits and there is no script. You will be scared and you will be ill after attending.
I can see it now. There you are, goose-stepping along the Champs-Elysees, when all of a sudden a zombie jumps out at you! Then they turn on the smoke machine. OH NO, IT'S ZYKLON-B!
The whole thing ends with Hitler doing the Monster Mash.