NEW ORLEANS — On a quiet street in the Gentilly neighborhood, a small brick house stands as a testament to one of the worst disasters in U.S. history. It's one of thousands of homes that flooded twenty years ago in Hurricane Katrina.

It's been preserved by Levees.org , a group founded by Sandy Rosenthal after the storm. She opens the gate to the house. "Come on in," she says. "As you look to the left, you'll see one of the trademark X's. These were put here by first responders. Each symbol has a meaning. This is the date, September 22nd. This is the number of people deceased in the home." If searchers find hazards like gas or a collapsed structure, they note it in the X.

A musty smell lingers inside the home, re-created by artists.

"This is actually all carefully placed, even though i

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