Virtual visitors to Mount Rushmore can now explore even more remote areas of the memorial than some who see it in person. Three-dimensional laser technology scans that captured every nook of the four presidential faces and other features of the monument last year mean that starting Tuesday, visitors will be able to take in-depth tours online of the Mount Rushmore National Memorial in western South Dakota. The portal, comprised of models of the monument, allows people remote access to the site to plan a visit or explore unusual areas. Online users are able to manipulate or dissect the three-dimensional models in various ways to learn more about the 60-foot granite carvings of Presidents George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln. The project is a five-year collaboration between the National Park Service and CyArk, a nonprofit project of the Kacyra Family Foundation based in Orinda, Calif. The Scottish government also provided resources and technology to perform the 3-D laser documentation.