STAN HONDA/Getty ImagesTo serious collectors, art is more than just something to hang on the walls. It’s an investment that can fetch astronomical prices at auction. Last year, a painting by Pablo Picasso set a world record by going under the gavel for nearly $180 million. But it’s not the first time a buyer has shelled out more than $100 million. Read on for 7 paintings that would break the bank for all but the super-rich.