Finistras Rock Wall, Spain

Near Mountain Montsec at Aragón, Spain rises the mysterious stones known as the Finistres China Wall.  Side by side position pointing to a non-natural construction. Also because they separate the river from the lagoon like if they were constructed on purpose to protect the inner valley.

From the parallel rock wall stands a small fortress

Jarlshof - prehistoric archaeological site in Shetland, Scotland.

Jarlshof is the best known prehistoric archaeological site in Shetland, Scotland. It lies near the southern tip of the Shetland Mainland and has been described as "one of the most remarkable archaeological sites ever excavated in the British Isles". It contains remains dating from 2500 BC up to the 17th century AD.

The Bronze Age settlers left evidence of several small oval houses with thick stone walls and various artefacts including a decorated bone object. The Iron Age ruins include several different types of structures, including a broch and a defensive wall around the site. The Pictish period provides various works of art including a painted pebble and a symbol stone. The Viking age ruins make up the largest such site visible anywhere in Britain and include a longhouse; excavations provided numerous tools and a detailed insight into life in Shetland at this time.