- Churches that are the principal church of a diocese, serving as the seat of the bishop, or of the archbishop, primate, patriarch, or pope of the diocese. They are generally grandiose structures and house the "cathedra," which is the throne of the bishop.
- Structures marking entry points into cities, often through defensive walls, fortified, and architecturally distinctive.
- Representations of humans, animals, or mythical beasts, in any medium.
- Creative works that depict settlements that may be considered towns or villages. For creative works depicting settlements that may be considered cities, use "cityscapes." For images that seem more documentary than creative, prefer "views." To designate the actual built forms of towns or cities as perceived visually and aesthetically, use "townscapes (built environment)."
- Refers to two-dimensional works of art, usually on a paper support, to which pigment suspended in water is applied with a brush to create an image or design. Includes paintings using gouache, which is not technically watercolor paint. Watercolors are variously classified as drawings or paintings in collections.
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