light blue in model B); and one with a diamond-shaped keystone (the Gothic arch, model C). Flying buttresses act the same way ancient Roman columns did, countering the horizontal force of the arch.

Columns were used in Roman architecture in colonnades - rows of evenly spaced columns - which were common features on Roman buildings. The columns from Bar Hill are thought to have been on the ...

The victory of the Roman emperor Trajan over the Dacians in back-to-back wars is carved in numerous scenes that spiral around a 126-foot marble pillar in Rome known as Trajan’s Column.