This time, if the optical illusion is clearly architectural, it’s blown up to a full Swiss village. Felice Varini applied here the rules that we well know to all the building of this nice little town. Source : Core77.
This is more science experiment than actual optical illusion, but since glycerin and glass have about the same refractive indices, just putting a glass bottle (or any other glass object) in a container filled with water and 1/3 of glycerin makes it disappear. YouTube link
This optical illusion known as Ames’ Window was developed by Adelbert Ames, Jr. YouTube link