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The circular tumulus was the most common form of early Greek tomb, often revetted by a vertical or sloping stone wall round the base, a type still seen in abundance in Etruscan necropoli like the "Necropolis of the Banditaccia" at Cerveteri near Rome. The top was a mound of earth, with (in the Greek world) one or more upright stones at the summit.
A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to bear weight.
English medieval walls often contain a mixture of cobbles, rubble and re-used brick, though the picture from Thetford shows almost exclusively cobbles. Some cobblestone architecture shows consistent matching in the size of the stones used, shape, and color. [5] This method of construction has been referred to as a form of folk art. [10]
Greek temples, normally rectangular in plan, generally had a pediment at each end, but Roman temples, and subsequent revivals, often had only one, in both cases across the whole width of the main front or facade. The rear of the typical Roman temple was a blank wall, usually without columns, but often a full pediment above.
The sides were built up by either large upright stones or walls of smaller stones laid atop one another. Some also had paved floors and some had blocking stones erected in front of them to seal the tomb such as at West Kennet Long Barrow. Their shape, which suggests an attempt to focus attention on the tomb itself may mean that they were used ...
External view of the Burg site Top of the rampart at Burg. Circular ramparts are found in north and western Europe, for example, in Denmark, Estonia, Sweden, Germany, Great Britain, Belgium and the Netherlands; in central Europe, in Austria and Switzerland; in southeastern Europe in Romania, Moldova and Ukraine; [3] and also in the United States. [4]