Start your tour by discovering St. Isaac's Cathedral, commissioned by Tsar Alexander I in 1918 and built in celebration of the victory over Napoléon. Marvel at the grand facades, richly decorated with beautiful sculptures. Step inside to explore the cathedral features, painstakingly detailed mosaics and vibrant columns of striking green malachite and blue lapis lazuli. Continue your tour at the equally magnificent Cathedral of Our Lady of Kazan, constructed between 1801 and 1811. See the incredible exterior stone colonnade, inspired by that of the iconic Roman Basilica, and its landscaped garden and central fountain. Head inside to see the cathedral's interior, adorned with columns, sculptures and religious icons. Finish your tour with a visit to a symbol of nationalism, the Church of Our Saviour on Spilled Blood. Find out how it was built on the spot where Alexander II was killed, discover its outstanding mosaics and brilliantly ornate domes on the facade of this majestic church. Inside, see the exceptionally beautiful marble flooring, elaborate mosaics and gilded columns.