NEW ORLEANS (Reuters) - Visitors to New Orleans who once toured the graceful mansions of its Garden District or learned the history of its Mississippi River plantations have a new attraction: The Hurricane Katrina disaster tour.

Gray Line New Orleans will begin on January 4 a "Hurricane Katrina Tour - America's Worst Catastrophe!" to show the ruin that befell the city when the storm hit on August 29, breaching a faulty system of river levees and flooding 80 percent of its neighborhoods.

Gray Line New Orleans normally organizes trips through the city's historic districts as well as its swamps and spooky cemeteries, but its business has been severely curtailed by the hurricane. The company said the Katrina tour was born of frustration over the government's slow response to rebuilding.

About 10 percent of the $35 ticket price for the three-hour tour will be donated to Katrina relief groups.