does it have any tomb?
Yes, the Tomb of the Unknown Soldier from World War I.
Arc de Triomphe
Beneath the Arc is the Tomb of the Unknown Soldier from World War I. 
mathematical concepts used in construction of gateway of india Yes, its arch has a height of with its central dome being in diameter. why was it built? t was erected to commemorate the landing of King-Emperor George V and Queen-Empress Mary. when? December 1911 who designed it? George Wittet what are his other designs? UNANSWERABLE what are its architectural features? Intricate stone latticework, elements of the Roman triumphal arch and 16th-century architecture of Gujarat. what are the examples of the second feature mentioned? Arc de Triomphe in Paris, the Narva Triumphal Arch in Saint Petersburg, the Wellington Arch in London why was the first one constructed? To honour those who fought and died for France in the French Revolutionary and Napoleonic Wars.
wiki:1562179
Arc de Triomphe [SEP] Tomb of the Unknown Soldier
Beneath the Arc is the Tomb of the Unknown Soldier from World War I. Interred on Armistice Day 1920, it has the first eternal flame lit in Western and Eastern Europe since the Vestal Virgins' fire was extinguished in the fourth century. It burns in memory of the dead who were never identified (now in both world wars). A ceremony is held at the Tomb of the Unknown Soldier every 11 November on the anniversary of the Armistice of 11 November 1918 signed by the Entente Powers and Germany in 1918. It was originally decided on 12 November 1919 to bury the unknown soldier's remains in the Panthéon, but a public letter-writing campaign led to the decision to bury him beneath the Arc de Triomphe.