The Guinness Book of World Records describes the bike as the world's tallest rideable motorcycle. Greg Dunham built the 15-foot high, 25-foot-long monster bike in three years. It weighs about 6,500 pounds and cost 300,000! Dunham steers it from a cage below the handlebars. The beauty shop owner said he created the monster bike because his friends said it couldn't be done and he wanted to prove it could.