Architecture is well-suited to infrared photography. Old buildings take on a spooky persona as skies go dark and foliage records as ghostly white – the late Sir Simon Marsden made a career out of this fact with books like The Haunted Realm. Modern architecture responds well, too, as the high contrast and starkness of infrared suits the strong lines and sharp angles of contemporary buildings. If you’re got an infrared-modified digital camera, use that. Alternatively, an infrared-transmitting filter such as the Hoya R72 will work fine.