Built in 1890 the 2376 feet (724 m) Walnut Street Bridge was the first to connect Chattanooga Tennessee's downtown with the North Shore. According to a plaque on the bridge Edwin Thacher was the chief engineer for the bridge. The bridge's superstructure was assembled by the Smith Bridge Company of Toledo Ohio which was a prolific late 19th-century bridge builder. The bridge's substructure was constructed by Neeley Smith and Company of Chattanooga. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
The answer to this question is:
Building