Camera Obscura and World of Illusions, formerly known as the Outlook Tower, is a building in Edinburgh, Scotland, on the Castlehill section of the Royal Mile next to Edinburgh Castle. Its origins began on Calton Hill where Maria Theresa Short formed an exhibition observatory some time before 1851. This moved to Castlehill in 1853 and was known as "Short's Observatory, Museum of Science and Art" from 1853 to 1892. The structure added two storeys to the pre-existing tenement to create this. The tenement is thought to be the original mansion of the Ramsays of Dalhousie (the "Lairds of Cockpen"), turned into small flats in the 18th century.