It used to be that if you wanted to explore remote corners of the Earth you needed a rugged ship and hearty crew, pack animals and native bearers, or dog sleds and a taste for tinned meat. Now, all you need is Google Earth, a desktop computer, and lots of patience. Armchair explorers have recently discovered ancient geoglyphs in Kazakhstan, a recent (< 5000 years) meteor impact crater in southwest Egypt, and a lost rainforest in Mozambique which, while known to local residents, was unknown to and never visited by scientists.