Bubenstein Castle (Ruine Bubenstein), also called Neu-Falkenstein, is a ruined spur castle on the northern side of the Höllental valley, about 500 metres west of Old Falkenstein Castle above the village of Falkensteig in the municipality of Buchenbach in the southwest German state of Baden-Württemberg.
The castle was built by Walter of Falkenstein in the 13th century and in 1266 its residents were recorded as the lords of Falkenstein. In 1328 the lords of Staufen were named as its occupants. In the 19th century, part of the castle rock was blown up for the railway line and in 1960 the castle was dismantled due to its poor state of repair.
The bergfried of the castle measured 10 by 10 metres, and the neck ditch was 5 metres deep and 8 metres wide. Of the old castle only wall remains and the neck ditch 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.