Icon of God and orchids at Roman Catholic Cathedral of St Dionysius. Built in 1865, this stone basilica displays an interesting portico, resting upon a marble colonnade. The evocative interior reveals three separate naves with an abundance of marble columns and haunting frescoes. Athens is the capital and largest city of Greece. It dominates the Attica periphery and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state. A centre for the arts, learning and philosophy.