Interior of the US Customs House, New Orleans, looking eerily ready for a seance. Construction began on the building in 1848 following designs of Alexander Thompson Wood. Wood was replaced by 8 successive architects that spanned the building's 33-year-long construction campaign. During Federal occupation of the city during the Civil War, the Customs House acted as a POW camp, at one time holding 2,000 Confederates prisoner in its unfinished walls. Today it stands as one of the best Greek Revival spaces in the country.