Medieval-origin Czech town squares hold many lessons for designers regarding the making and shaping of great urban outdoor rooms. Charac- ter, community, and economic longevity appear to be by-products of these urban spaces, and they serve as excellent models for reference. Ar- tifacts of evolution, medieval town squares cannot be recreated. The intention of this work is not to be prescriptive but to describe and illustrate the set of spatial properties common to town squares of medieval origin (A.D. 900-1400) in the region of Bohemia, Czech Republic. The spatial patterns are the essential common denominators that have assisted the squares in remaining coherent architectural entities over the centuries. They are useful, either singularly or collectively, in informing rather than determining the investigative and design process.