On top of the Říp Mountain is a romanesque rotunda of Saint George, which is one of the oldest buildings in the Czech Republic. This is mentioned for the first time in 1126, when Soběslav I, Duke of Bohemia, commemorating his victory at the Battle of Chlumec, where he defeated Holy Roman Emperor Lothair III, had the rotunda repaired and extended by the western circular tower. The rotunda's current appearance is the result of a purist reconstruction during the 1870s.
Inside the rotunda is a stone sculpture by contemporary Czech artist Stanislav Hanzík 'The Good Shepherd' from 1979, symbolising the arrival of Czech ancestors to the country and the beginning of Czech history there.
Near the rotunda is a tourist hut that was built in 1907 and still serves travellers today.
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.