Neuschwanstein Castle (German: Schloss Neuschwanstein) is a 19th-century historicist palace on a rugged hill above the village of Hohenschwangau near Füssen in southwest Bavaria, Germany. The palace was commissioned by King Ludwig II of Bavaria as a retreat and in honour of Richard Wagner. Ludwig chose to pay for the palace out of his personal fortune and by means of extensive borrowing, rather than Bavarian public funds. Construction began in 1869, but was never fully completed.
The castle was intended as a private residence for the King, until he died in 1886. It was open to the public shortly after his death. Since then more than 61 million people have visited Neuschwanstein Castle. More than 1.3 million people visit annually, with as many as 6,000 per day in the summer.
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.