Charity Hospital is one of the United States' oldest hospitals. The New Orleans facility was founded in 1736. At its height, the hospital served more than 100,000 patients a year. When Hurricane Katrina hit in August 2005, about 200 patients and doctors were trapped in deplorable conditions.
Allison Davis O'Keefe for CNN
During Katrina, the hospital had no power, water or food. Some patients were on ventilators being worked by hand pumps; the bodies of those who died were stored in stairwells, as the hospital's morgue had flooded.
Allison Davis O'Keefe for CNN
A Six Flags theme park in New Orleans was flooded during Katrina.
Allison Davis O'Keefe for CNN
The park was never reopened, repaired or demolished.
Allison Davis O'Keefe for CNN
A cross in the water off Shell Beach, Louisiana, honors victims of Katrina who were from St. Bernard Parish. According to FEMA, Katrina was "the single most catastrophic natural disaster in U.S. history."
Allison Davis O'Keefe for CNN
City Park in New Orleans is one of the nation's oldest urban parks. The park lost more than 2,000 trees in the wake of Katrina.
Allison Davis O'Keefe for CNN.
Irish Bayou was flooded during Katrina, which swept away homes, trailers and boats. But one structure withstood the storm -- a fishing cabin built to resemble a castle.
Allison Davis O'Keefe for CN
A hotel chair sits inside a former Ramada hotel in New Orleans. The hotel, which is now abandoned, sustained 4 feet of flooding during Katrina.
Allison Davis O'Keefe for CNN
After the storm, the hotel was leased to FEMA to house displaced residents. They stayed for eight months before it became uninhabitable, looted and vandalized.
Allison Davis O'Keefe for CNN
The Crescent City Connection bridges connect New Orleans with the west bank of the Mississippi River. Following Katrina, the bridges were closed as thousands tried to flee, a move that caused much outrage.
Allison Davis O'Keefe for CNN
The Lower Ninth Ward is dotted with empty lots and abandoned cars even 10 years afterward.
Allison Davis O'Keefe for CNN
A light fixture remains intact on the inside of a home in the Lower Ninth Ward.