the shared or ecumenical () church of St. Bartholomäus are listed as Swiss heritage sites of national significance. The Ad Fines hill is now eroded by the Thur and Mühlebach rivers, and has nearly vanished in the south and east. Of the wall, only parts of the north and west still survive. It was not until the excavations of the 1976, 1980–81 and 1990–92, that the fort was better understood. The walls were about high. A total of six semi-circular towers are known, though location of the gate and the moat are still unknown. Very little is known about the layout and type of buildings that were within the approximately area enclosed by the walls. A sod fountain and the remains of wooden buildings are all that has been found. The castle was also found along with a small, neighboring cemetery. Many coins and other objects found in the cemetery and the rest of the interior indicate that the fort was occupied Roman soldiers, including mounted troops, from the later 3rd century until the beginning of the 5th century. In 1944, the prehistoric site at Breitenloo was excavated and 17 different houses were found. The houses are located along a north–south main street with the gables facing the street. The buildings are almost exclusively built with two naves and have lengths of and widths from . It is striking that several houses of vastly different sizes lay side by side, suggesting perhaps larger homes with smaller farm buildings. The house floors were all built with complex support structures and overlying split boards, which were usually covered with clay. Midden heaps in the soil and partial scorch marks on the support structures suggest that at least some buildings were lifted quite high off the ground. Economy , Pfyn had an unemployment rate of 0.93%. , there were 134 people employed in the primary economic sector and about 50 businesses involved in this sector. 343 people are employed in the secondary sector and there are 27 businesses in this sector. 216 people are employed in the tertiary sector, with 53 businesses in this sector. there were 1,336 workers who lived in the municipality. Of these, 677 or about 50.7% of the residents worked outside Pfyn while 326 people commuted into the municipality for work. There were a total of 985 jobs (of at least 6 hours per week) in the municipality. Of