We visit Baltimore’s Inner Harbor to tour the U.S. sloop-of-war Constellation. Built in 1854, USS Constellation is the last all-sail warship built by the U.S. Navy, and the only Civil War-era ship still afloat. She was first commissioned in 1855, and was last decommissioned in 1955. Chris Rowsom, executive director of Historic Ships in Baltimore, is our guide. This is the first of a two-part program.