I have always loved optical illusions. There is something about messing with perspective that truly fascinates me. Below I include some of my favorites of forced perspective from various sources (see below for full list).
This video gave me the idea for this blog:
Additionally images discovered through the following articles:
http://www.hongkiat.com/blog/force-perspective-photos/
http://prafulla.net/graphics/photography/assorted-optical-illusion-forced-perspective-photography/