Sinkhole - corvettemuseum
Irony. "Caution Step Down" sign is meant for the steps to the right; however, now it serves another purpose. 

Permission given to use this image with credit to the National Corvette Museum

Irony. "Caution Step Down" sign is meant for the steps to the right; however, now it serves another purpose.

Permission given to use this image with credit to the National Corvette Museum