The Saint-Isaac's Cathedral is one of the finest monuments of architecture of the XIX century after the project of A. Montferrand. The Saint-Isaac's is the former principal cathedral of the Russian Capital, the largest cathedral in the city with capacity up to 10 thousand people. It is decorated by 112 monolith granite columns 114 tons each and by 400 relieves and bronze sculptures. You'll enjoy a splendid panorama of Saint Petersburg and its suburbs from the colonnade. The dome is covered with the thinnest layer of gold, which was painted into green during the Blockade to prevent it from being destroyed.