Like a fossilized party favor, this romantic, ersatz Greco-Roman ruin is the memento San Francisco decided to keep from the 1915 Panama–Pacific International Exposition. The original was built in wood, burlap and plaster as a picturesque backdrop by celebrated Berkeley architect Bernard Maybeck, but by the 1960s it was beginning to crumble. The structure was recast in concrete, so that future generations could gaze up at the rotunda relief to glimpse 'Art under attack by materialists, with idealists leaping to her rescue.' Further renovations in 2010 restored the palace to its former glory. Plan to pose for pictures by the swan lagoon.