I wasn't even aware that there was a Santhome Cathedral built on the grave of St Thomas, one of only two Cathedrals in existence built on a grave of an original apostle, with the other being St Peter's Basilica! Praise God!
It's just a quibble, but St. Peter's in Rome is not a Cathedral. Also, the article at the top of this thread is in error, as St. Paul's in Rome is also the tomb of an apostle.
In Ephesus, Turkey are the ruins of the Basilica of St. John the Divine, built atop his tomb...