The Photographers' Gallery was the first independent gallery in Britain to be solely devoted to photography. It has an ever-changing programme of exhibitions, focusing on the best in international contemporary photography. A visit here is always full of surprises, as no two exhibitions are alike. This is a thriving place that attracts all those interested in viewing or producing photographs, so its surprising that its still one of London's less well-known galleries. There's also an excellent bookshop, which stocks over 5,000 titles and runs a worldwide mail order service. The gallery is hoping to move to larger premises, but hasn't yet been successful in finding a suitable location. There's no admission fee, but they do rely on people becoming members to keep running.