12 Years a Slave filmed at Columns Hotel, New Orleans. The hotel where Northup is taken and wined and dined before being enslaved, standing in for the Gadsby Hotel in Washington DC. On screen it's Gadsby Hotel.

Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
Planning the trip? The United States travel atlas covers money, language and getting aroundand everything filmed in New Orleans is on one page
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in New Orleans and it tells you what was shot around you, how to get there, and whether you can actually go in.
Download Venture for iOS Android