I think we've posted about all or nearly all of these buildings on Neatorama, but it's nice to see 'em all in one neat post. Here's WebUrbanist's 5 Incredible Works of Insane Architectural Genius: Wooden Skyscrapers to Recycled Wonderlands.
The one on the upper right hand corner is Forevetron (previously on Neatorama here):
Tom Avery (aka Dr. Evermore) is responsible for the world’s largest scrap-metal architectural sculpture known as Foreverton. Weighing in at over 300 tons this amazing structure climbs 50 feet in the air and reaches 60 to 120 feet in either direction. Once the owner of a salvage business, Avery began turning his talents to this bizarre architectural pursuit over two decades ago and (supposedly) believes a spaceship contained within will launch him eventually into supernatural world beyond our own and bring him into contact with the Divine.