Designed by the architect Auguste Montferrand, St Isaac’s Cathedral is an outstanding monument of mid-19th century late Russian Neo-Classicism. Noteworthy is the Cathedral’s interior decoration, representing all forms of monumental and decorative arts – painting, sculpture, mosaic and colored stonework. Its main iconostasis is adorned with columns of malachite and lapis lazuli, while the main altar features the stained glass Christ Risen, a feature rarely seen in an Orthodox church.