The Cultural Landscape Foundation® recently announced their yearly list of threatened and at-risk landscapes and landscape features, which, like the Watts Towers, are all land-based art: ancient and modern.

For its annual collection of threatened and at-risk landscapes and landscape features, The Cultural Landscape Foundation® chose eleven examples of land-based art from ancient petroglyphs to earthworks, folk art creations and others endangered due to possible demolition, as well as neglect, poor maintenance, vandalism and lack of funding.

Titled Landslide® 2014: Art and the Landscape the sites were selected from more than 100 submissions and are detailed through in-depth narratives and newly commissioned photography. The eleven chosen for the list are:

The works of Athena Tacha located throughout the U.S.

Leo Villareal's The Bay Lights located in San Francisco.

Mary Miss Greenwood's Pond: Double Site located in Des Moines, Iowa.

Tyree Guyton's The Heidelberg Project located in Detroit.

Noah Purifoy Outdoor Desert Art Museum of Assemblage Sculpture in Joshua Tree, Calif.

Harvey Fite's Opus 40 located in Saugerties, N.Y.

Robert Morris' Untitled (Johnson Pit No. 30) located in Seatac, Wash.

Simon Rodia's Watts Towers located in Los Angeles.

Wells Petroglyph Preserve located in Mesa Prieta, N.M.

Frances Bagley's and Tom Orr's White Rock Lake Wildlife Water Theater located in Dallas.

Russell Page's 70th Street Garden located in New York City.

All of them can be viewed here.