An undated artist's rendering from Nelson Byrd Woltz Landscape Architect & Paul Murdoch Architects shows a proposed design for Constitution Gardens, one of three underused and neglected areas of the National Mall in Washington, which architects and designers have been competing for the chance to renew. (AP Photo/Nelson Byrd Woltz Landscape Architect & Paul Murdoch Architects)

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An undated artist's rendering from Nelson Byrd Woltz Landscape Architect & Paul Murdoch Architects shows a proposed design for Constitution Gardens, one of three underused and neglected areas of the National Mall in Washington, which architects and designers have been competing for the chance to renew. (AP Photo/Nelson Byrd Woltz Landscape Architect & Paul Murdoch Architects)