The ruins of the Revište Castle near Hliník nad Hronom stand on top of steep rock about 100 m above the floodplain of the river Hron. There is a wonderful meadow below the castle used by canoeist as a camping site.
The castle was built in the 13th century as part of protection to central Slovakian mining towns and the trade route running along the Hron. Renaissance fortifications were added to the older Gothic part of the Castle. Mercenaries of the rebellious magnate Imrich Thököly conquered the castle and converted it in ruins in 1678. Only some Castle walls survive.
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.