In 2000, on the millennium of the adoption of Christianity in Iceland, Þorgeirskirkja (Þorgeir's Church) was consecrated at Ljósavatn. It was built as a memorial to the conversion to Christianity, and commemorates Þorgeir, chieftain of Ljósavatn, who played a crucial role in the conversion. On his return from the Alþingi after being baptised, Þorgeir is said to have flung his images of the Norse gods into a waterfall, known since then as Goðafoss - Waterfall of the Gods. Þingey (Assembly Isle), just below the waterfall, was an ancient assembly site, where traces of old structures are visible. The county of Þingeyjarsýsla derives its name from Þingey.
Þorgeir's Church is a "travellers' church". Its staffed in summer by a guide who provides visitors with information about the place and its history.