The present Invermark Castle is on the site of a 14th-century castle. The castle belonged to the Lindsays of Crawford. It was designed to control Highland marauders. It was here that David Lindsay, 9th Earl of Crawford died in 1558. The present castle was built in the 16th century, and heightened in the early 17th century. The castle was abandoned in 1803.
The 16th-century castle was a three-storey structure, having a corbelled parapet and parapet walk. The additions were another storey and a garret, and a two-storey angle-tower. The castle walls have rounded corners. Two massive chimney-stacks have window-openings giving the garret light.
The entrance, at first floor level, was reached by a movable timber bridge or stair. The entrance, a rounded arch, which still has an iron yett, led to the hall, to which a small room is attached. A wheel stair was the only access to the vaulted basement. The turnpike stair by which access could be gained to the upper floors, which were also subdivided, no longer exists.
The entrance to the castle is barred and well above ground level, making the interior virtually inaccessible to visitors.
There are foundations of outbuildings to the east and south of the tower; material known to have been robbed from the site to build the parish church probably came from here.
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.