The Aqueduct of Diocletian is an ancient Roman aqueduct near Split, constructed during the Roman Empire to supply water to the palace of the emperor Diocletian. The Aqueduct of Diocletian was constructed between the end of 3rd and beginning of the 4th century AD, at the same time as the palace.
The aqueduct took water from the river Jadro, 9 kilometres northeast of Diocletian's Palace, today Split's city centre, and brought water to the Palace over a height difference of 13 m. Another aqueduct took water from the same source to Salona.
The aqueduct was destroyed in the invasion of Goths in the middle of 6th century and did not work for thirteen centuries after that.
The first reconstruction of the aqueduct took place during the reign of the Austro-Hungarian Empire (1877–1880). The Diocletianic aqueduct was abandoned in 1932, when the modern water station was built in Kopilica, a peripheral area of Split. The best-preserved part of the aqueduct near Dujmovača (Solin) has a maximum height of 16.5 m and a length of 180 m.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.