The longest bridge in the world, The Lake Pontchartrain Causeway, is a causeway composed of two parallel bridges crossing Lake Pontchartrain in southern Louisiana, United States. The longer of the two bridges is miles long. Going here during the summer!
Louis Cathedral (Cathedral-Basilica of St. Louis, King of France) in New Orleans. It's the oldest Catholic cathedral in use in the US -- just steps away from Bourbon Street in Jackson Square. Toured the cathedral in Jan 2013 - beautiful!