Niagara Falls, Ontario's Nightmares Fear Factory has a Flickr feed full of visitors being terrorized in its environs. I grew up with the spookhouses of Niagara Falls, and they can be incredibly scary, even the basic Lundy's Lane spookhouse, which is often just a dark maze populated by bored locals with night-vision scopes who whisper menacingly in your ear or touch you unexpectedly. I've never tried Nightmares, but it has a reputation for being seriously terrifying.
(via Colossal)