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This stone church is believed to be the oldest churches in Finland. It was constructed in the 13th century out of local red granite and limestone. It is dedicated to King Olaf II of Norway, the patron saint of the Aaland Islands. The church was expanded in the 17th and 19th centuries, with its latest expansion being a stained glass window dedicated by American artist Ture Bengtz in 1968.

This concrete church was built in 1962 in order to accommodate the Catholic population of central Finland.

St. Olaf's Church was founded in the 12th century by the Scandinavians who occupied the city at that time and was named after King Olaf II of Norway. The building has been preserved as it was rebuilt in the early 15th and 16th centuries. The church also had to be partially rebuilt after fires in 1625 and 1820. The tower, which was destroyed in the fire of 1820, was restored in 1840, and at the same time, the neo-gothic interior of the church was completed.

St. Olaf's Church in Ulvila is a medieval stone church built between 1495 and 1510. The bell tower was built by J. Winberg of Pori in the 1750s and rebuilt by Georg Theodor Chiewitz in 1862. The church of Ulvila received its first organ in the 1890s.

The church was consecrated on 24 August 1856 and converted into a cathedral when the Catholic Diocese of Oslo was founded in 1953. It is the second Catholic cathedral in Oslo (the cathedral of Saint Hallvard became Protestant at the Reformation in 1537).

The St. Onuphrius is a Greek Catholic church. Records describe a wooden church that stood on the same spot. This church was built in the 13th century, during the reign of Leo I of Halych. A monastery was built next to the church during the second half of the 15th century. The current stone building was built in 1550, but it has been destroyed and rebuilt several times.

The parish church of St. Oswald was built in the 11th century in the Romanesque style. A late Gothic building was then mentioned as early as the 14th century. In the middle of the 18th century, from 1752 to 1755, the church was rebuilt in the Baroque style. The tower had a baroque dome which was destroyed by lightning in 1834 and replaced by the current pointed helmet.

St. Pantaleon is one of the twelve great Romanesque basilicas in the old town of Cologne. The church, built in the 9th century, was included in a Benedictine abbey of the same name until the secularization of the monastery at the end of the 18th century as an abbey church.

St. Panteleimon is a monastery church erected in 1164 by the Byzantine prince Alexei Angel. On its walls, you can find well-preserved frescoes which, due to their qualities, constitute one of the greatest achievements of Byzantine painting from the time of the Komnenos dynasty (12th century).

St. Paraskevi Church, built around 1700, is the best preserved Lemko Church in Poland. Renovated for the last time in 2011, it is listed since 2013 on the UNESCO World Heritage List with other wooden churches.