Mobile guide in St. Isaacs Cathedral of St. Petersburg - a free tour in audio format with interesting facts about the cathedral and the authors photographs. During a half-hour tour around the cathedral, you will learn many interesting facts about the history of its creation, the importance of each of the sculptural groups, as well as the little things that are not always visible even for experienced travelers.Tour of the St. Isaacs Cathedral was created with a group of "Colors of the North", in which we can find a lot of interesting trips to fascinating places of the Leningrad region.