Exploring the Caldera at Santori, Greece.
A large, mostly submerged, caldera volcano is located south of the Agean Sea. The volcano sits roughly 120 kilometres north of Crete and measures approximately 12km by 7km with 300m high steep cliffs on three sides. It is still active to this day, with its last eruption occurring in 1950.
It has been said that the cataclysmic Minoan eruption of Santorini in the 17th Century BC (1700 BC-1601 BC) is what may have inspired the famous legend of Atlantis. The eruption was rated a 7 according to the Smithsonian Global Volcanism Program's Volcanic Explosivity Index, making it the highest historical eruption in recorded history.
Whether or not this event was the inspiration for, or points to actual evidence of, the demise of the lost city of Atlantis, one will never know. However, it is still worth noting that worldwide catastrophes have been talked about across all major religions, with contemporary works corroborating such claims; led primarily by researchers Graham Hancock and Randall Carlson.