In art history, a "capriccio" is an architectural fantasy, often involving ruins or fragments. Other examples will pile up details on more details, having fun with mash-ups of famous or entertaining buildings. Here's one in Photoshop, done in a looser style than I usually choose, with Italianate ruins and dark cypress trees. If you were there, you could hear the cicadas buzzing.
Photoshop, 7" x 10", July 12, 2013.