Below are some Great Optical Illusion created by Puzzling World which is an optical illusion attraction located in New Zealand. They have numbers attractions, Optical illusion rooms and even a giant Maze (labryinth).
The Leaning towers is a great Illusion!
Leaning Tumbling Tower illusion
The illusion below is call an Ames Room creating the Optical Illusion o objects appearing different sizes in different areas of the room.
Ames Room Illusion
The Tilted Room
Tilted Room Illusion
Roman Toilets
Roman Toilets Illusion
the last one is a little akward.