Camera Obscura

For me the most interesting place we visited in Edinburgh was the Camera Obscura. It is named for the actual camera obscura on the top floor, which uses a mirror to project an image of its Edinburgh surroundings on a table in the middle of the room. The lower floors of the Camera Obscura building are a museum of optical illusions. I liked the scientific approach they took -- they don't try to do the tourist trap "mystery spot" nonsense.

Here's a picture of one of the illusions:

And a sudden role reversal! How can they do that!