St Isaac’s Cathedral (Isaakievskiy Sobor) in St Petersburg, Russia, is a 19th century neoclassical church designed by the French architect, Ricard de Montferrand and consecrated in 1858.
St Isaac’s is one of the city’s principal and most impressive churches, boasting a breathtaking blend of multicoloured marble, paintings, mosaics and plasters. St Isaac’s also has a 43 metre high observation tower, offering splendid views of the city.