it became so popular that in 1873, quartermaster general montgomery meigs designed a small amphitheater near the arlington house to hold the decoration day ceremonies. in time, that became such a small venue, because, every year, thousands of people would show up to arlington. one year, we found that 25,000 showed up to decorate the graves. so, in 1913, congress authorized this memorial we are standing 1915 -- we are standing in. in 1915, as part of laying the cornerstone, this memorabilia box was placed by woodrow wilson. he laid the first stone which now brings us to the memorabilia box and its history. ms. smith: when the memorial amphitheater began construction in 1915, construction dragged on for about five years. the amphitheater was actually dedicated in 1920. the building has largely been the same as it has been for 100 years, but there has been, over time, several modifications. one of the largest was in the 1970's, as the viewing of the chain being -- the changing of the guard at the tomb of the unknown soldier became so popular. the steps in the plaza were expanded. when that