The balroom of the Catherine Palace, Tsarskoe Selo, Russia. Designed by Italian Architect Francesco Bartolomeo Rastrelli - Court Architect to Empress Elizabeth and master of the Russian Rococo/Late Baroque style.
The image shown here is an example of Rococo decoration of a structure or building. It has a sense of chaos in the piece, this was different than the previous Baroque style. Rococo decor often featured vine-like images.