This is actually several museums located on both sides of St Louis Cathedral on Jackson Square. It is nice that it is right in the French Quarter among the retail and restaurant locations and you can get a AAA discount.
I will start with my favorite, the Katrina exhibit on the first floor of the building to the right of St Louis Cathedral. It is extremely well done and shows both the devastation and how a number of people experienced the hurricane. It was very sad at times, bringing me to tears. I felt I was there with them during the storm. I would make sure to see this particular floor if your time is limited.
Upstairs is a very nice exhibit of Mardi Gras. We found it to be a good addition to what we learned at the “Mardi Gras World” warehouse. There are a lot of old costumes, many with hand sewn sequins and the like.
In the building to the left as you face the cathedral, is a 3-floor history museum filled with items, charts, mini-movies and visual aides. It has everything from the time of the American Indians to the French and Spanish, the Louisiana Purchase, Civil war and reconstruction – everything you ever wanted to know or forgot about the local history. It can be a bit overwhelming, but there is a lot of history packed into the three floors.
The last museum we visited was on floor 2A, into an adjoining building, is a history of rock and roll. Old 50-60s music played as we looked at old posters and pictures of local musicians, some of which I never knew were from or at some time stayed in New Orleans.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.