Padrão dos Descobrimentos (Monument to the Discoveries) is located along the river where ships departed to explore and trade with India and Orient. The monument celebrates the Portuguese Age of Discovery during the 15th and 16th centuries.
In 1958 the Ministry of Public Works, the Overseas Provinces and the Câmara Municipal of Lisbon, promoted the intent to construct a permanent Monument to the Discoveries. Between November 1958 and January 1960, the new monument was constructed in cement and rose-tinted stone, and the statues sculpted from limestone excavated from the region of Sintra.
Inaugurated on 9 August 1960, it was one of several projects nationwide that were intended to mark the Comemorações Henriquinas (the celebrations marking the anniversary of the death of Henry the Navigator).
References:Регистрация
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.