This 300-room UNESCO World Heritage–designated residence was constructed over a period of 60 years in the 18th century. An extraordinarily lavish palace, it was created under the auspices of two Schönborn prince-bishops, Lothar Franz and Friedrich Carl, who brought enormous knowledge and passion to the project, as well as a budget for the best of the best. The magnificent grand staircase boasts the world’s largest ceiling fresco, painted by Giovanni Battista Tiepolo. Portions of the building were damaged by Allied bombing in 1945, but fortunately most of the historic furnishings had been stored off-site and key rooms were unharmed, so you can see the original—and matchless—artwork, gilding, and statuary. Check out the spectacular Hall of Mirrors and the imposing Imperial Hall, which boasts a large oval dome and 20 half-columns.