There is probably the best haunted maze I have ever been to that is privately owned and is located right down my block.
Here's a video of KTLA covering the location about two years ago...it has improved a lot since then.
I'm not sure if all of you are familiar with the So Cal area of the US, but there are amusement parks that transform into a horror park filled with all kinds of mazes and monsters that walk around and scare the crap out of you.
The one down the block beats all that, hands down. It incorporates so many effects and perspectives than any other "professional" maze I have seen. I was really impressed with the fact that you choose three directions when you hit the middle of the maze, leading you in two different mazes, the third one is a trick door that shoots fire at you.
The actors systematically scare you...I've seen one couple where they hid the husband away from his wife and left his wife all alone as the lights came back on...how scary is that for the chick??? It's amazing they put so much effort into it.
Probably the one where the got me is where they had the lights turn on and off so that it's pitch black for approximately 5 seconds...and then a monster appeared in front of my face... AHH
The part I "enjoyed" most is they had a TV playing THE RING video of Samara coming out of the well, and they actually had an actor crawl out of the "TV" (it was actually a projector and a screen) but the effect isn't over yet! They had two actors play Samara...they had one actor come out the tv and dissappear somewhere and they had another Samara come out from another direction, something totally I did not expect and shrieked...it brought back teenage memories of first watching the movie.
I saw one fellow piss his pants...no lie
Hands down, the best haunted maze in So Cal.
Here's their myspace page: