Felipe VI and Queen Letizia of Spain visit the United States (10 images)

Spain's King Felipe VI (L) and Queen Letizia walk the grounds of America's first President George Washington, September 15, 2015, at Mount Vernon, Virginia. The Royals visit was to emphasize the long standing historic relations between Spain and the United States. Photo by Mike Theiler/UPI

Spain's King Felipe VI (R) and Queen Letizia visit the tomb of America's first President George Washington, as soldiers in colonial uniforms stand guard, September 15, 2015, at Mount Vernon, Virginia. Photo by Mike Theiler/UPI

U.S. President Barack Obama hold a bilateral meeting with King Felipe VI of Spain in the Oval Office of the White House in Washington, DC on September 15, 2015. Pool Photo by Dennis Brack/UPI

Spain's King Felipe VI (2nd,R) and Queen Letizia are briefed by Mount Vernon President Curt Viebranz as they visit the tomb of America's first President George Washington, as soldiers in colonial uniforms stand guard, September 15, 2015, at Mount Vernon, Virginia. Photo by Mike Theiler/UPI