Flavius Josephus, or Yosef Ben Matityahu (as he was known in more Hebraic circles) was a well known philosopher/historian in the 1st century AD. Famous for such works as Antiquities of the Jews and Jewish Wars, Josephus also left us a clue… where to find King Herod’s tomb.

Around the bier were Herod’s sons and a large group of his relations; these were followed by the guards, the Thracian contingent, Germans and Gauls, all equipped as for war. The reminder of the troops marched in front, armed and in orderly array, led by their commanders and subordinate officers; behind these came five hundred of Herod’s servants and freedmen, carrying spices. The body was thus conveyed for a distance of two hundred furlongs to Herodium, where, in accordance with the directions of the deceased, it was interred. So ended Herod’s reign. — excerpt from The Jewish Wars

So, an architect, Ehud Netzer, at the Hebrew university spent a life-time years looking for the tomb… guess where he found it.

It took 35 years for Netzer to identify the exact location, but on May 7, 2007, an Israeli team of archaeologists of the Hebrew University led by Netzer, announced they had discovered the tomb.The site is located at the exact location given by Flavius Josephus, atop of tunnels and water pools, at a flattened desert site, halfway up the hill to Herodium, 12 kilometers (7.5 mi) south of Jerusalem. – thanks Wikipedia

Here’s a video… (I preferred this one but can’t get it to embed)