Crakehall Hall
Videos
Crakehall Hall is a historic building in Crakehall, a village in North Yorkshire, England.
The building, in 2010
Keystone (architecture)
Videos
A keystone 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 th
Dropped keystone at Colditz Castle
Keystone from the palazzo Borgazzi (Milan, Italy)
Keystone much enlarged for decorative effect, and carrying a coat of arms, Barcelona
The York Minster Chapter House rib-vault ceiling with central and peripheral keystones