We were fortunate to be visiting New Orleans in September 2006 just after the new IMAX movie, Hurricane on the Bayou, had premired. The movie tells the story of Hurricane Katrina's impact on the bayou, and it shows how the erosion of the bayou swamps is erasing the natural hurricane protection system around New Orleans. The movie is excellent and it will motivate you to look for ways to improve the natural environment in the Mississippi River delta. The IMAX theater itself was very nice (and air conditioned!).
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