Philip is mentioned in all four Gospels as being among the disciples closest to Christ. He is often associated with that Philip who preached to the Ethiopian eunuch (recorded in Acts, chapter 8), however there is plenty of reason to suspect that there were two Philips who each played a prominent role in the history of the early church. Philip the Apostle is said by tradition to have been martyred at Hierapolis (located in the present-day Turkish province of Denizli). Philip is reported, like his friend and fellow apostle Peter, to have been crucified upside-down.
From the article at World Bulletin...
The tomb of St. Philip the Apostle, one of the original 12 disciples of Christianity's central figure Jesus Christ, has been discovered during the ongoing excavations in Turkey's south-western province of Denizli.This is turning into a very exciting time for Biblical archaeology. In the past few years we have found the tombs and other remnants of many people associated with Christ: from the ossuaries of James and Caiphas, and now the resting place of Philip. We also now have ancient documentation of Pilate, and significant evidence of Joseph's time in Egypt (not to mention what can only be described as an "advertisement" for the services of one Balaam the Prophet).
Italian professor Francesco D'Andria, the head of the excavation team at the Hierapolis ancient city in Denizli, told reporters on Tuesday that experts had reached the tomb of St. Philip whose name is mentioned in the Bible as one of the 12 Apostles of Jesus.
Professor D'Andria said archeologists had been working for years to find the tomb of the Biblical figure, and finally, they had managed to reach the monument while working on the ruins of a newly-unearthed church in Hierapolis.
D'Andria said the structure of the tomb and the writings on it proved that it belonged to St. Philip the Apostle, who is recognized as a martyr in the history of Christianity.
Hey, who knows: maybe someday we'll get really lucky and finally locate pieces of Noah's Ark :-)