The nominations will be formally put forth to the U.N. Educational, Scientific and Cultural Organization World Heritage Committee in 2013, the Department of the Interior said in a release.
"World Heritage Sites are unique places of natural beauty and historic and cultural importance that are celebrated by people of all nations," Salazar said. "The remarkable prehistoric earthworks of Poverty Point connect us to those who inhabited our land thousands of years ago, while the buildings of Frank Lloyd Wright are a testament to one of the world's foremost architectural geniuses. They deserve to be recognized as World Heritage Sites."
If selected, the prehistoric earthworks at Poverty Point and the collection of Frank Lloyd Wright buildings will join such sites as the Grand Canyon in Arizona, the Taj Mahal in India and the Great Barrier Reef in Australia.