Grüningen castle was built before 1229. It was in early times owned by the Counts of Regensberg. From the original castle only the Palas exists. At the place of the today's church stood a chapel since at least 1396, which was extended 1610. In 1782 it was demolished and rebuilt in its early Classicist style.
For centuries, the castle has been the residence of bailiffs. They have been assigned for the administration and justice over the large area at the Zurich Oberland from Lake Zurich to the Töss Valley. The museum gives an overview of the history of Grüningen, the bailiwick and sovereignty with its castle and country town. The museum is located at the first floor of the castle building and is open from April to October.
The church of the former Franciscan monastery was built probably between 1515 and 1520. It is located in the UNESCO World Heritage Site of Old Rauma. The church stands by the small stream of Raumanjoki (Rauma river).
The exact age of the Church of the Holy Cross is unknown, but it was built to serve as the monastery church of the Rauma Franciscan Friary. The monastery had been established in the early 15th century and a wooden church was built on this location around the year 1420.
The Church of the Holy Cross served the monastery until 1538, when it was abandoned for a hundred years as the Franciscan friary was disbanded in the Swedish Reformation. The church was re-established as a Lutheran church in 1640, when the nearby Church of the Holy Trinity was destroyed by fire.
The choir of the two-aisle grey granite church features medieval murals and frescoes. The white steeple of the church was built in 1816 and has served as a landmark for seafarers.