- The World's Largest Ball of Paint in Alexandria, IN ($12 million)
- Barney Smith's Toilet Seat Art Museum in Alamo Heights, TX ($10 million)
- Carhenge in Alliance, NE ($25 million)
- The Giant Lava Lamp in Soap Lake, WA ($143 million)
In the interest of full disclosure I should note my wife and I honeymooned at Carhenge... seriously.