There has been a very large tomb discovered near Amphipolis. Archaeologist date it to the time of Alexander the Great and think it might be his tomb but no evidence has been discovered yet to confirm the claim.
News Reports on the Archaeological Discovery:
http://www.bbc.com/news/world-europe-28758920
http://www.foxnews.com/science/2014/08/27/alexander-great-era-tomb-will-soon-reveal-its-secrets/
http://www.history.com/news/tomb-dating-from-the-time-of-alexander-the-great-found-in-northern-greece
http://www.theguardian.com/science/2014/aug/12/archaeologists-greece-tomb-alexander-great
http://www.dailymail.co.uk/sciencetech/article-2401057/Have-archaeologists-discovered-grave-Alexander-Great-Experts-enormous-marble-tomb-fit-king-Greece.html