Broch of Mousa

The Broch of Mousa stands on the western shore of the island of Mousa in the Shetland Islands, overlooking Mousa Sound, the narrow stretch of water separating the island from the South Mainland of Shetland. It is accessible by boat from Sandwick, Shetland, south of Lerwick. Mousa Sound forms part of a network of sheltered waterways that historically connected communities across the Shetland Islands, where travel between settlements was often easier by sea than over land. The broch is built on a flat rock surface at the end of a low coastal promontory close to the shoreline. Mousa is a small, treeless island of open grassland and heath typical of the Shetland landscape. Its rocky coastline includes small natural inlets that provide landing places for boats. From its position near the shore, the broch commands wide views across Mousa Sound toward the South Mainland. The open terrain offers little obstruction to visibility, allowing activity on the surrounding waters to be seen from a considerable distance. From the upper levels of the tower, much of the sound and nearby coastline would have been visible, allowing those within the broch to observe boats approaching the island or travelling along nearby sea routes. The location may have been chosen for both practical and strategic reasons. The nearby lagoon provided sheltered landing places and access to marine resources, while the position overlooking the sound offered clear views of maritime traffic between the islands. The surrounding land would also have provided pasture for livestock and space for associated settlement and field systems. ==Description==

Mousa Broch has one of the smallest overall diameters of any broch, as well as one of the thickest wall bases and smallest interiors; this massive construction (as well as its remote location) is likely to be the main explanation for its excellent state of preservation. It stands high and is accessible via a single entrance at ground level. The entrance is on the west side but has been altered at various times from its original appearance. and amongst the best-preserved prehistoric buildings in Europe. ==Later history==

Mousa Broch continued to be used over the centuries and is mentioned in two Norse Sagas. Egil's Saga tells of a couple eloping from Norway to Iceland who were shipwrecked and used the broch as a temporary refuge. The Orkneyinga Saga gives an account of a siege of the broch by Earl Harald Maddadsson in 1153 following the abduction of his mother, who was held inside the broch. The geologist and antiquarian Samuel Hibbert visited it in 1818 and provided a detailed account of the site. The first accurate survey was conducted by Sir Henry Dryden in 1852 and 1866. == Archaeology and discoveries ==

Because the Broch of Mousa survives almost completely intact, archaeological investigation has focused less on large-scale excavation than on documenting the architecture and history of the standing structure. Built around during the later Scottish Iron Age, the tower remained standing for centuries, and much of the archaeological material that might otherwise accumulate within a collapsed ruin was removed during later reuse and nineteenth-century clearing. The interior was first cleared of accumulated rubble in 1861, more than two thousand years after the broch was built. Excavators recovered large quantities of animal bones, particularly those of otters, which had likely inhabited the abandoned structure, along with fragments of pottery vessels, stone pot lids, and a slaty stone object described as resembling a triangular file. One of the most unusual discoveries was a carved wooden model of a Norwegian boat, about long and made from fir. Further clearing was carried out in 1919 by the Office of Works, though relatively few additional artefacts were recovered. Some pottery sherds, including part of a Black-burnished ware vessel, are now held in the National Museum of Scotland. Although artefactual evidence from the site is limited, the architecture of the broch itself provides important archaeological evidence. Within the central court are a hearth, a stone floor tank, and a low stone bench running around the inner wall, indicating domestic activity during at least one phase of occupation. The tower walls also contain three ground-floor cells built into their thickness, entered through raised thresholds about above the floor and fitted with recesses that may have served for storage. Evidence indicates the broch was modified during the Iron Age. In its earliest phase the structure may have contained a timber roundhouse supported by posts and resting on scarcement ledges built into the inner wall at heights of about . This was later replaced by a wheelhouse-like arrangement with stone piers projecting into the central space. Modern archaeological work has focused mainly on recording and conservation rather than excavation. Major stabilisation was undertaken between 1967 and the 1980s, and in 2005 archaeologists used 3D laser scanning to document the structure and support conservation planning. ==Storm petrels==

Mousa Broch is well known among birders for its breeding European storm petrels, which are best seen after dark on partly or on completely overcast summer nights. The island holds around 6,800 breeding pairs in total, representing about 8% of the British population and about 2.6% of the world population. Some of these birds nest in burrows within the broch itself. ==See also==