The enclosing wall has half columns of the Doric order in a lower story and Ionic half columns in a second. Of the buildings inside, the "peristyle" in front of the royal residence makes the best impression, because the space enclosed by it was thoroughly cleared out by the Emperor Francis I. of Austria, nearly a century ago, a benefaction duly recorded on a tablet inserted in an adjacent wall. Many of the columns of the peristyle itself, however, are still half embedded in the walls of buildings too important to be torn down. A building which is now generally identified with the mausoleum of Diocletian forms the present cathedral, the campanile of which caused the destruction of a portion of a peristyle enclosing the mausoleum. This mausoleum is a round building like the Pantheon, and like the latter has a perfectly preserved dome which, unlike that of the Pantheon, was not open at the top. About a quarter of a century ago the interior was restored under the auspices of the ill-matched and ill-fated Rudolf and Stephanie, who are mentioned on a conspicuous tablet, not as furnishing any cash for the enterprise, but as _presentibus et opus admirantibus_. The interior, forty-two feet in diameter, with eight large columns framing four niches and bearing eight smaller columns superimposed, makes a fine impression, although the space seems rather small for a cathedral. A sculptured frieze encircling the dome at the bottom, and containing, among other things, hunting scenes, must be catalogued as "shapeless sculpture."