The Roman aqueduct Peña Cortada is the main attraction of Valencia’s La Serranía region. The aqueduct gives you the opportunity to walk through tunnels carved in rock, cross impressive bridges, and admire unique scenery of the area.
The colossal work of hydraulic engineering was built by the Romans in the 1st century AD. The aqueduct is one of the most important in the country and conserves sections over 28km. The most spectacular elements are the Rambla de Alcotas Bridge, the Barranco del Gato Bridge and the Peña Cortada in Calles, an impressive vertical cut followed by a gallery carved in the rock that can be visited.
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.