The magnificent Archcathedral is a must-see when visiting Lublin. It is a former Jesuit church, built in 1586-1604. The temple was built according to the design of Italian architects Jan Mario Bernardoni and Joseph Bricci, in the Baroque style. The church was modeled on the Roman Jesuit temple Il Gesu. In 1604 the church was consecrated by the Cracow bishop Bernard Maciejowski and received a call of St. John the Baptist and St. John the Evangelist. Along with the church, the Jesuits built a college which buildings once surrounded today's Cathedral Square. After a fire in 1752, the church was rebuilt. At that time, the famous illusionist polychromes by master Joseph Mayer were created.

In 1773 Pope Clement XIV decided on the dissolution of the Jesuit order. For a short time the church and the complex of Jesuit buildings were taken over the Trinitarian order. Then the Austrian partitioners turned the church into a grain warehouse. In 1805, when the diocese of Lublin was created, then a decision was made to renovate the church with a purpose of making it a cathedral. The main architect of the reconstruction was Antonio Corazzi. A classicist portico with six columns was added at that time, and the Trinitarian Tower was heightened. The cathedral was largely destroyed as a result of German air raids in September 1939.

In addition to the illusionist polychromes, there are other interesting things to admire in the temple, such as the baroque altar made of Lebanese pear wood, relics of St. John Paul II, and the Tribunal Cross in the Chapel of the Holy Sacrament, which once hung in the main hall of the Crown Tribunal. The image with the image of Our Lady of Częstochowa is surrounded with special reverence. On July 3, 1949, the gathered faithful noticed tears on Mary's face. For several days, thousands of believers from all over Poland came to the church to witness the "miracle of Lublin".

In the Archcathedral, one must also see the amazing Acoustic Vestry, where people standing on opposite corners can talk to each other in a whisper, and the columns painted on the vault seem to be moving. There's also see a unique treasury and crypts where Lublin bishops are buried. An exhibition "Cult - history - legends. Lublin Archcathedral - the heir of the monuments and tradition" consisting of mementos from the non-exisitng church of St Michael the Archangel, among others, is located at the choir.

The cathedral can be visited every day outside the services.

Next to the Cathedral stands the Trinitarian Tower. It was originally a gate leading to the Jesuit College buildings. The name of the tower derives from the name of the Trinitarian Order, that owned the former Jesuit buildings at the turn of the XVIII and XIX centuries.

The tower was designed by the Italian architect Antonio Corazzi. The works were completed in 1827 and the tower's appearance has not changed since then. Its base is a medieval defensive wall. The neo-gothic tower is about 60 meters high, it has a quadrilateral body and an octagonal superstructure topped with a conical roof covered with sheet metal. The tower has two façades of the same design, facing the Old Town and the Cathedral Square. From the east and west it is adjoined by the former Jesuit buildings. The main axis of the façade is framed by two pilaster strips running along the entire quadrilateral body. The vaulted passage is topped with a sharp arch, above which there is a triangular cornice with a cube decoration.

The tower houses the Lublin Archdiocese Museum, which presents a collection of religious sculptures, paintings, and many other interesting exhibits. There is an observation deck at a height of 40 meters, from which one can admire the panorama of Lublin. To get there, one has to climb several levels and as many as 207 stairs. The entrance to the tower is from the side of the Cathedral Square. Please note that in bad weather (rain, snow, strong wind etc.) the the tower is closed.