The Cathedral of Vasily the Blessed (Russian: Собор Василия Блаженного), commonly known as Saint Basil's Cathedral, is a church in Red Square in Moscow, Russia. The building, now a museum, is officially known as the Cathedral of the Intercession of the Most Holy Theotokos on the Moat (Russian: Собор Покрова пресвятой Богородицы, что на Рву) or Pokrovsky Cathedral (Russian: Покровский собор).[5] It was built from 1555–61 on orders from Ivan the Terrible and commemorates the capture of Kazan and Astrakhan. A world famous landmark,[6][7] it was the city's tallest building until the completion of the Ivan the Great Bell Tower in 1600.