Treehouses

With people creating homes in shipping containers, old disused train carriages, windmills and abandoned barns, you'd be forgiven for thinking that the human race is running out of space. Treehouses, long the territory of small children with slingshots (and the odd father kipping on the floor after forgetting their anniversary again), have started to move into the mainstream. There are a lot of reasons to move from a house to a tree (the obvious eco and view-related ones aside). Don't like your neighbours? Try a squirrel instead. Fed up with drunkards throwing litter into your front garden? Hoist it 20 feet into the air. Images via Treehouse Workshop: