The two castles of Kleinvernich and Großvernich have guarded the eastern and western banks of the river Erft since 1350. The two-part Grossvernich Castle, known as a 'castrum' with a moat, was built after 1300 near the surrounding wall, which today is hardly discernible.
Kleinvernich Castle is still entirely surrounded by a moat today. However, the estate is used exclusively for agriculture. The only memorial to the late-gothic castle in Grossvernich is the ruin of a tower which is in danger of collapse.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.