DO THEY NOW? Rosslyn Chapel was built to protect the skull of St Matthew, researchers claim.
Needless to say (I trust), if there is anything to this idea at all, it is vanishingly unlikelty that the skull in question had anything to do with the actual apostle Matthew. But Rosslyn Chapel is really cool and I encourage you to visit it if you happen to be in Scotland. Preferably in warmer weather than on my trip several years ago, noted here.