The Cistercian Church of the Holy Trinity, the blessed virgin Mary and St. Bernard, called olive, or Oliwa Cathedral Basilica, was founded in 1178. The history of its emergence dates back to the reign of Prince Sobeslav First. One day, while hunting, he was seriously wounded. A local farmer had bandaged the wound, saving the Prince's life, after which Subslave First appeared in a dream an angel with an olive branch, and it was therefore decided to establish a Church in this place called Oliva.

The Church was seriously damaged by fire 1350. It was later rebuilt in the Gothic style. The Church survived the second fire in 1577, and the interior was rebuilt in Baroque style.

Oliwa Basilica is one of the most popular architectural structures in Gdansk. It is the longest Basilica in Poland, built in the shape of a Latin cross, with a dome and three naves. Its length is 107 meters. The Church's interior is decorated with 23 of the altar. Special attention of tourists is a wonderful complex organ, which was the largest in Europe at the end of the eighteenth century. It is made in the Rococo style of the more than eight thousand pipes of tin and wood. Every year from may to September you can enjoy organ concerts using musical instruments of the eighteenth century.

Near the Basilica is a picturesque Oliwa Park, where there are interesting buildings – the Palace of the abbots of the monastery. In the building of the monastery is a Museum. This historic Park lies on the territory of the gardens at the monastery. In it you can see the plants from different parts of the world, the rock garden, waterfall, grotto, greenhouse, ponds with ducks and stunning hornbeam alley of the XVII century. The Park includes a network of Bicycle and walking paths.