4Orvieto Cathedral

The cathedral consists of a nave with six bays and two aisles, and is cruciform in shape. The interior has deliberately been left uncluttered and spacious. The interior, like the exterior, is decorated with alternative rows of basalt and travertine but only to a height of about 1.5 m. The rows above them were painted in alternative rows of black and white stripes in the late nineteenth century.

The cylindrical columns also consist of alternate rows of travertine and basalt. Their shape and ornamentation evolved during the construction of the cathedral, as well as the decoration of the capitals. The alabaster panes in the bottom parts of the aisle windows keep the interior cool during the fierce Italian summer, while the neo-Gothic stained-glass in the upper parts of the windows date from 1886 to 1891 and were designed by Francesco Moretti.