Today is the anniversary of the death (actually, the exact date of his death is unknown) in 1943 of Nikola Tesla. He seems little known, but his scientific contributions were great, including the invention of the radio for which he holds the patent. There is a Tesla Museum in Belgrade. PBS has a site devoted to him. About.com has an overview and links.
Nikola Tesla: The Genius Who Lit the World (a 42-minute Tesla Memorial Society video):