Catch a show at the Margravial Opera House in Bayreuth, one of the most opulent opera houses you'll ever see. It was built in honor of the marriage between Frederick the Great's niece and a Bavarian Duke in 1748, and it has been preserved impeccably — only a curtain, stolen by Napoleon's troops in 1812, is missing. Fun fact: Richard Wagner lived in Bayreuth from 1871 until his death in 1883.