It's the National War Memorial in Ottawa,Ontario,Canada.It was designed by Vernon March,who won the design competition that was held in 1925.The Memorial was dedicated on May 21st,1939 by King George VI.While originally intended to honor the dead of World War I,it was re-dedicated in 1982 to also honor those who died in World War II and Korea.The tomb of the Unknown soldier was added in 2000.
The building in the left background is the east block,officially known as the Eastern Departmental Building building,on parliament hill.It was completed in 1866.