Once these have countered the weight of the keystone (and whatever's on top of it), the arch will support itself. It's hard to be sure when (or why) the first arch was built. We do know that the ...

Even until relatively modern ... triumphal arch fused both beauty and practicality, standing as a conspicuous symbol of Roman innovation and power. From planning to completion, building an ...

Sophie Jackson of Museum of London Archaeology called it “one of the most significant discoveries” in years in London’s oldest quarter, the City — the square-mile financial district where modern glass ...