Broch An Iron Age stone structure, also known as a roundhouse. Built throughout Scotland, concentrated near the coasts, as a defence against raiding parties. The walls are double skinned, providing small rooms and storage areas between the inner and outer walls. Steps were also built in the gap between the walls. A megalithic chambered tomb, with a large flat stone laid on upright ones.
Cromlech is an obsolete term meaning the same thing.
A mound of stones, often but not always covering a burial site. See the separate category for round cairn. This category includes long cairns and other miscellaneous cairns. Man Chambered Cairn Chambered Tomb Megalithic tomb usually for multiple burials. Varieties include passage graves, gallery graves, portal dolmens.