The famously beautiful Cathedral of Saint Basil's in Moscow's "Red Square" marks its 450th birthday. The origins of the church date back to the 14th century and is dedicated to the Trinity, but the structure really shows several churches linked together. The one currently known was built by Ivan the Terrible in 1554, the church's domes are an icon really to the Blessed Virgin Mary and later named popularly to recall the life of a local saint, Basil.
Google commemorates this history. Rome Reports has a video story.