Close to the Scala there is the 18th century Palazzo Clerici, which contains one of the finest artworks in Milan: the famous fresco of Giambattista Tiepolo "The Sun's chariot, guided by Mercury, illuminates the world". As the building now houses the Institute for International Policy Studies (ISPI), the Galleria degli Arazzi (Tapestry Gallery) of which the fresco decorates the ceiling, can only be visited on appointment or on some special dates (see the ISPI website).The ISPI website also offers a virtual visit (flash player required).The tapestries in the Galleria are from Brussels and designed by Rubens, representing four events in the life of Moses.Another beautiful Tiepolo fresco may be admired at the Palazzo Dugnani.