The Cenotaph
A cenotaph - which literally means Empty Tomb in Greek - is a tomb or monument erected to honour a person or group of persons whose remains are elsewhere.
Standing in Whitehall is probably the best-known cenotaph in the modern world. It was designed by Sir Edwin Lutyens and constructed from Portland stone. It is undecorated save for a carved wreath on each end and the words "The Glorious Dead".
The sides of the Cenotaph are not parallel, but if extended would meet at a point some 1 mile (1.6 km) above the ground. Similarly, the "horizontal" surfaces are in fact sections of a sphere whose centre would be 900 feet (270 m) below ground.
It is flanked on each side by various flags of the United Kingdom. The flags displayed since 2007 represent the Royal Navy, the British Army, the Royal Air Force, and the Merchant Navy.
Uniformed service personnel (excluding fire and ambulance personnel) always salute the Cenotaph as they pass. The Cenotaph is the site of the annual National Service of Remembrance held at 11.00am on Remembrance Sunday, the closest Sunday to 11 November (Armistice Day).