The history of the Haikko manor dates back to 1362 when a Dominican monastery owned the site. Jöns Olafsson Stenbock bought the manor and Haikko was a residence of Stenbock family for next 400 years. In 1871 it was bought by general Sebastian von Etter. Several members of the Russian Imperial family visited Haikko because von Etter was a close friend to czar Nicholas II. During the revolution in 1917 Grand Duke Kiril´s eldest son Wladimir was born and christened at Haikko. He was the nearest aspirant to the imperial crown of Russia and he became later the head of the Romanov family.
Current main building was built in 1913. The Vuoristo family purchased the manor in 1965. Today Haikko provides conference center, spa and hotel facilities.
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.