Happy Birthday to us! The U.S. Department of the Interior was officially created on March 3, 1849. For 170 years, Interior’s mission has expanded to include protecting and managing our natural resources and cultural heritage, providing scientific solutions and honoring trust responsibilities to our nation’s first people. With public lands being what we’re best known for, instead of candles on a cake, we’ll celebrate with sunlight glowing on a gorgeous mountain. Photo at Glacier National Park in Montana courtesy of Christina Adele Warburg-Hon.