Edinburgh's Camera Obscura (meaning "dark room") is a fascinating and delightful way to take advantage of the wonderful views of the city from Castle Hill. Located immediately beside Edinburgh Castle, this intriguing attraction is housed in a Victorian rooftop chamber at the apex of the Outlook Tower. Inside this mysterious room you can see moving images of Edinburgh's panorama projected onto the walls by the giant periscope. As the oldest purpose built attraction in Edinburgh the Camera Obscura has been entertaining and entrancing visitors since 1892. Now the attraction also includes the World of Illusions which takes a whimsical look at optical illusions and tricks of the light.