Walled City is a term used to describe cities that are surrounded by walls or fortifications. The three crossword solutions for this term are CHESTER (7 letters), York (4 letters) and Avila (5 letters). CHESTER is a city in England, located in the county of Cheshire. It is known for its well-preserved city walls, which were built in the Roman era. York is a city in North Yorkshire, England, and is also known for its walls, which were built in the medieval period. Avila is a city in Spain, located in the province of Castile and Leon. It is known for its ancient walls, which were built in the 11th century.