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Ludlow Castle: Gate-way of Chapel, in Ludlow, Shropshire, England more
Late Norman also is the very curious round chapel of St. Mary Magdalen, which stands in the middle of the ward, and displays a particularly fine entrance door with zig-zag moulding, and another arch opening into the place where the now-vanished chancel stood. The interior, now  open to the sky, was once very elaborately decorated with woodwork of armorial designs, which was standing perfect in the late eighteenth century. (p. 139)
The zig-zag decoration on the arch is very characteristic of late Norman architecture, some 900 years ago.
There is an official Ludlow Castle Website too.