STEEL Connections - CCS
AISC - Beam to Beam with directly welded flanges and shear plate
corner joint http://www.hometalk.com/735768/timber-frame-garden-structure/photo/154462
true timber frame homes used joinery with no nails - from Carpenters Medieval Houses
Wood pins and joints. Late 17c house construction.
How to make your own functional geodesic dome in your backyard with PVC pipe. Because why wouldn't you want to do that?
Here are 15 awesome uses of PVC pipes in your home and garden.