1 A monument to someone buried elsewhere, especially one commemorating people who died in a war.
1.1 the Cenotaph – The war memorial in Whitehall, London, designed by Sir Edwin Lutyens and erected in 1919–20.
Early 17th century from French cénotaphe, from late Latin cenotaphium, from Greek kenos ‘empty’ + taphos ‘tomb’.
The Washington Monument serves as a national symbol for the USA while also being a cenotaph, of sorts. President Washington’s remains are buried at Mount Vernon, Virginia.