Here's a really cool story about an old LA hotel that was sold and during the liquidation process an old mosaic mural was found behind some wall paneling:

During the clearance sale, a puzzling discovery was made: a fifteen-foot mosaic mural commissioned by The Los Angeles Petroleum Club was found behind some old wood paneling. The Club had at one time maintained a posh member’s suite at the hotel. This is where the intrigue and mosaic sleuthing begins.