St.Isaac's cathedral and Church of the Savior on Spilled Blood

The St. Isaac's Cathedral (Russian: Исаакиевский Собор) is the largest and most sumptuous Orthodox cathedral of St. Petersburg, in Russia, and the fourth largest cathedral in the world. The cathedral, dedicated to Saint Isaac of Dalmatia, a patron saint of Peter the Great, was built between 1818 and 1858 in a predominantly neoclassical style with the inclusion of Byzantine ornaments.
The Church of the Savior on Spilled Blood is a church of St. Petersburg, located on the shore of Griboedov Canal (named in honor of Aleksandr Griboyedov) near the park of the Russian Museum and Nevsky Avenue.