The World War l Unknown is below the marble coffin. Other Unknowns are beneath the white slabs on the ground to the left of the guard.  

The remains of the Unknown Soldier are committed to the ground during
the burial services of 1921.

The Tomb of the Unknowns (or Tomb of the Unknown Soldier as it is often called) is  
a monument dedicated to U.S. Service members who have died without their remains being identified. It is located in Arlington National Cemetery in Virginia. On November
11, 1921, President Warren G. Harding officiated the interment ceremonies at the Cemetery. The Tomb of the Unknowns has been continuously guarded, 24 hours
a day, 7 days a week, since July 2, 1937.

 
Mount Hood

Timberline lodge, located on the south side of Oregon’s Mount Hood ,was built as a
Works Progress Administration (WPA) project during the Great Depression between
1936 and 1938. President Franklin D. Roosevelt (above at podium) dedicated the
Lodge on Tuesday September 28, 1937, five months before the completion of the
interior of the lodge in February, when it was opened to the public.