Mentioned by Out About Scotland
Historic Buildings in Edinburgh - Complete Visitor Guide
"Address: Castlehill, Royal Mile, Edinburgh EH1 2NDWebsite: Camera Obscura Edinburgh. The Camera Obscura is one of the oldest purpose-built attractions in the United Kingdom and tens of thousands of visitors pour through its doors each year. Camera Obscura and World of Illusions is located in a prime location on The Royal Mile, not far from Edinburgh Castle and more-or-less opposite The Scotch Whisky Experience."