The most elegant church in Tyachiv is a stone Reformed church with a three-tier bell tower. A real clock has been placed on it since 1810, and it is also very old. Inside the temple, you can admire the beautiful caisson polychrome ceiling of 1748. The temple was founded in the 13th century by King Ladislaus the Great. He was Roman Catholic then. In 1556, the church became Reformed. Until 1944, it housed the largest library of the Maramoros region and the Tyachiv city archive. The walls and windows have been preserved in the temple building since the 13th century. There is an active body in the church. The Reformed Church looks very beautiful in May, when the chestnut trees are blooming near it. The church was built in the Gothic style and is included in the register of architectural monuments of national significance.