The folks at National Geographic just did a solid favor for all the adventurous outdoor photographers out there. They put every US Geological Survey (USGS) topographical map from across the United States on one easy-to-navigate site and made them easy to print out at home.
Helsinki, Finland-based photographer Janne Parviainen has been light painting since 2008, and recently created series of experimental photos showing a technique he calls Light Topography. Using a single LED light for each image, he carefully traces over every surface in the scene while the camera's shutter is open. Fully tracing a room can take as long as half an hour. The resulting light outlines provide a trippy look at what each space contains.