So while we were in St. Louis Outsider Art Fair, we took a detour on our last day to a place called Cementland.
"Cementland is a public art exhibit under construction on the 54-acre site of a former cement factory just north of St. Louis, Missouri. The brainchild of sculptor Bob Cassilly, who also created St. Louis' City Museum, it contains giant concrete sculptures and obsolete machinery, and is to have navigable waterways, among many other features."
I'd never even heard of it before, but I learned basically what you can read from that Wikipedia paragraph and thought it sounded interesting. I had no idea it was going to be a massive, sprawling property with more dangerous awesomeness than you can shake a stick at.
We spent hours exploring every building, climbing questionable ladders to the tops of said buildings and crossing some pretty terrifying "bridges". But it was a blast.