It's a strange experience to walk across the little wooden bridge above reeds rippling in the lake into Ireland's Celtic past as a jumbo jet passes overhead on its way into Shannon Airport—1,500 years of history compressed into an instant. But if you love all things Celtic, you'll have to visit the Craggaunowen Project. The romantic centerpiece is Craggaunowen Castle, a 16th-century tower house restored with furnishings from the period. Huddling beneath its battlements are two replicas of early Celtic-style dwellings. On an island in the lake, reached by a narrow footbridge, is a clay-and-wattle crannóg, a fortified lake dwelling; it resembles what might have been built in the 6th or 7th century, when Celtic influence still predominated in Ireland. The reconstruction of a small ring fort shows how an ordinary soldier would have lived in the 5th or 6th century, at the time Christianity was being established here. Characters from the past explain their Iron Age (500 BC–AD 450) lifestyle, show you around their small holding stocked with animals, and demonstrate crafts skills from bygone ages.