Yes, it is very interesting. Even just getting the basics of who-is-who and where and the times involved correct changes your whole outlook on a lot of collateral history, as well as making the entire Old Testament come alive. It also gives the New Testament new and important meaning.
Lots of luck on learning much about the Celts and The Lost Tribes of Israel in traditional religion history classes. As Americans we are quite ignorant of much history other than our own. I received the bulk of my knowledge on the subject as a Post-Doctoral student at Oxford University studying Biblical Archeology. Did additional post-doc at Trinity College in Dublin studying the early Celts. They were experts on these subjects long before we were a nation, but somehow that didn't make it across the pond into either our seminaries or universities. (And there are others who think it is important the Lost Tribes remain "lost" or "assimilated" or otherwise not "found".)
It's also important to spend time in Europe at the great Celtic sites of Hallstadt in Austria and Le Tennes in Switzerland. The continental europeans have an important broader perspective which the English miss. Some Brits belive the Lost Tribes are the Celts alright, but are only found in Cornwall, Wales, Brittany and Ireland. This narrow (little island) perspective manifests itself in English language book after book, each one copying the other, and most getting the big picture all wrong. Continentals see the dispersion picture more clearly.
For an excellent jump-start on the subject, the little book at my LostTribe Profile site discussing the Assyrian Tablets in the British Museum is the best I've found so far. Those 20,000+ clay tablets from Assyria blow the old myths and superstitions apart!