Saint Isaac's Cathedral or Isaakievskiy Sobor. Ticket from Russia

Saint Isaac's Cathedral or Isaakievskiy Sobor in Saint Petersburg, Russia is the largest cathedral (sobor) in the city and was the largest church in Russia when it was built (101.5 meters high). It is dedicated to Saint Isaac of Dalmatia, a patron saint of Peter the Great who had been born on the feast day of that saint.

Isaakievskiy Sobor