The distinctive Bridge of Sighs is just one of many architecural highlights of the building which Henry Hobson Richardson considers his best work, the Allegheny County Courthouse & Jail in downtown Pittsburgh. The Bridge of Sighs is one of 720 bridges within Pittsburgh city limits, and one of more than 1,700 bridges criss-crossing Allegheny County. Pittsburgh has more bridges than any city in the world except for Venice, Italy.

