Photos

The roof of Stephan's Dom.
A brief description below, courtesy of Wikipedia:
"A glory of St. Stephen's Cathedral is its ornately patterned, richly coloured roof, 110 meters (361 feet) long, and covered by 230,000 glazed tiles. Above the choir, on one side of the building the tiles form a mosaic of the double-headed eagle that is symbolic of the empire ruled from Vienna by the Habsburg dynasty, and on the other the coats of arms of the City of Vienna and of the Republic of Austria are depicted. In 1945, fire caused by World War II damage to nearby buildings leapt to the north tower of St. Stephen's Cathedral and went on to destroy the roof. Replicating the original bracing for so large a roof (it rises 38 meters above the top of the walls) would have required an entire square kilometre of forest, so over 600 metric tons of steel bracing were used instead. The roof is so steep (an 80-degree pitch in some areas) that it is sufficiently cleaned by the rain alone and is never covered by snow."