Well, you can't really buy these houses, or rent them for that matter, but you can visit them! And that will just have to fulfill your fort-living fantasy. Environmental artist Patrick Dougherty has been at the Brooklyn Botanic Garden constructing these "branchwork sculpture," and he's been tracking the progress here. The final, site-specific sculpture will be finished by August 21st and will stand over the next year... as long as the material it's made from—all collected in Staten Island's Ocean Breeze Park—doesn't fully decay throughout the seasons.