WATTS TOWERS - UNITED STATES
A work of monumental architectural sculpture, the Watts Towers are constructed of a structural steel core, wrapped in wire mesh which has been covered with mortar, and inlaid with tile, glass, shell, pottery, and rocks. Set in only a fourteen-inch foundation, the tallest of the towers is ninety-nine and a half feet tall. The west tower, begun in 1921, contained the longest reinforced concrete columns in the world upon its completion, an important record in the history of architecture. The stability of the entire monument is ensured by its innovative architectural design embodying universal structural principles found in nature.