Tiarno di Sotto is well-known for its residences, which can be easily admired along a walk through the village.
Findings in the surroundings imply that the spot was already settled in Roman Age. In the 10th century the village was divided into two parts, when the residents of the San Giorgio hill expanded down to the valley (the today's Tiarno di Sopra) while the residents of the Lèngros hill moved to the opposite side (today Tiarno di Sotto).
Today Tiarno di Sotto consists of the districts of Moi, Villa and Degara. On the market square the Saint Bartholomew Church is located which houses precious artworks. From various documents it is clear that formerly there was a little church with rectangular groundplan, dated back to 1348. This church was extended and rebuilt several times in course of time. Important are the 72 m high church steeple from natural stone and the altarpiece of the high altar. It dates from 1587 and is attributed to the Venetian School of Tintoretto.
About 1 km from Tiarno di Sotto the little church dedicated to Saint George is located on a hill. A comfortable walking path proceeds up and you are rewarded with a fantastic view on the villages in the valley. On a walk along the Massangla river a 15th-century mill is located, which houses a small museum today and you also pass the beautiful Gorg d'Abiss waterfall.