Tromøy church was originally a Romanesque stone church built around 1150. The church was reconstructed to a cruciform church between 1748-1758, and today this fabulous church is one of Arendal's oldest sights. The church is an old seamark, and due to the unsheltered location, the church is without a tower. The interior of Tromøy church is beautiful. There are wood carvings and painted interior from the 1750s, restored in 1926-1939. Several details in the church are worth mentioning, like the baptismal font made of soapstone from the 14th century, and candlesticks made of brass from 1660.
Important people were buried inside the church in the Middle Ages, both in the choir and in the nave. The tombs had large gravestones in the church floor. It has been illegal to bury people inside the church since 1805, and the large gravestones were moved outside during the restoration in the 1750s. They are now visible along the churchyard wall in the west, together with boulders from Tromøy.
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The Broch of Gurness is an Iron Age broch village. Settlement here began sometime between 500 and 200 BC. At the centre of the settlement is a stone tower or broch, which once probably reached a height of around 10 metres. Its interior is divided into sections by upright slabs. The tower features two skins of drystone walls, with stone-floored galleries in between. These are accessed by steps. Stone ledges suggest that there was once an upper storey with a timber floor. The roof would have been thatched, surrounded by a wall walk linked by stairs to the ground floor. The broch features two hearths and a subterranean stone cistern with steps leading down into it. It is thought to have some religious significance, relating to an Iron Age cult of the underground.
The remains of the central tower are up to 3.6 metres high, and the stone walls are up to 4.1 metres thick.