Megalithic Walls of Altamura - Credit: Wikimedia Commons
The Megalithic Walls of Altamura () are defensive walls dating back to the 4th century BCE. They were the city walls of the ancient city of Altamura, Italy. Nowadays, only a few parts of the original wall remain; the original track of the wall spanned over a length of about 3.6 km. They were about 4 meters high, while the base of the walls was about 5 meters wide. Read more on Wikipedia
Source: en.wikipedia.org