One of the most important Orthodox sanctuaries in Poland, with a male monastery founded in the XV century. The most valuable monuments include: an orthodox church complex from the turn of XIX and XX centuries, an orthodox church of St. Onuphrius together with gate buildings and a belfry, and outside the walls, two chapels - of Dormition of the Mother of God and of the Holy Spirit.

According to legend, the monastery was founded at the end of the XV century, in a place where the waters of the Bug river brought the miraculous icon of St. Onuphrius. The inhabitants of the surrounding villages, reading this sign as a manifestation of Divine Providence, built the first chapel and established a hermitage in which they guarded the holy image. The hermitage was later transformed into a monastery, which today is one of the strongest centers of Orthodoxy in Poland.

The intensive development of the monastery was interrupted after the conclusion of the Brest Union in 1596, when the Uniates tried to take over the Orthodox religious buildings at all costs. The monastery in Jabłeczna was the only one to resist these pressures, thus choosing the path of suffering and persecution. The second half of the XIX century started a new bright period in the history of the monastery, known for its comprehensive educational and religious activities. In 1889, a school for psalmists was opened at the monastery, which educated many excellent conductors of church choirs. In 1906, a two-story house was built in the village of Jabłeczna, intended for a parish school. Candidates for catechists and teachers of grammar rules were educated there. The monks were entrusted with conducting religious lessons and overseeing the moral education of young people.

In the years 1900-1914, a number of renovations were carried out in the monastery: the interior of the main temple was restored, the walls were covered with frescoes of high artistic value, and two wooden chapels were erected behind the walls of the monastery. At a distance of 5 km from the monastery, a "skit" (hermitage) for the anachorets was established near the lake. Two wars brought a series of devastations. With time, the burned-down buildings were rebuilt and all traces of war devastation were removed. Currently, there are 10 monks in the monastery who, according to tradition, deal with prayer, work, meditation, and strengthening the Orthodox faith in the Bug River areas.

The calm neighborhood of Jabłeczna comes alive every year on June 24 and 25, when thousands of believers celebrate St. Onuphrius' Day. After the evening service and the night vigil in the church, around 3:00 am, the procession goes through the Bug River meadows towards the Holy Spirit Chapel. The view of the procession of the faithful with hundreds of candles, gliding in the misty twilight through empty meadows, remains in the memory for a long time.