It was built at the end of 15th century using larch wood in place of an old church. It has been preserved until toady in an unchanged form and it is one of the most valuable wooden Gothic buildings in Poland. Inside the church visitors may admire the treasures of medieval painting and sculpture. Special attention should be paid to the triptych depicting St. Leonardo, and side triptychs presenting the adoration of the baby Jesus and St. Nicolas. The wall polychromes and ceiling paintings depicting numerous biblical scenes also enrapture visitors to the church. St. Leonardo's Church is also listed by UNESCO as one of the World Heritage Sites.