The huge towers of the Tın Cathedral in the Old Town Square are a counterpart to the historical town hall. The Curch of the Virgin Mary before Tın (Kostel Panny Marie pred Tınem) was originally a hospital church, founded together with the hospital around the 10th century in the commercial Tın yard. Merchants gathered here, bringing a large variety of goods often from very faroff countries. They paid custom duty, also called "ungeld", for the things they sold. Still preserved is the Starı Ungelt, which stands for The Old Customs Yard.

In the 14th century, the hospital church was converted into the main cathedral of the Old Town. The Gothic building with three naves, bordered on two sides by houses, was not completed until the year 1511, when the southern tower was finished. This delay was caused by the Hussite Wars and an event at the end of them. With the timber, which was meant for the construction of the roof, on the order of the detested Emperor Zikmund, a three storey gallows was built. 52 comrades of Jan Rohác z Dubé, one of the last defeated "Taborist" leaders, were hanged here. Before, the church was a centre for both parties (The Holy Communion of the Blood and Body of Christ). At the beginning of the Catholic counter-reformation, the church was taken over by the Jesuits in the year 1623.

The Tın Cathedral ranks among the most beautiful Gothic creations in Bohemia. The cathedral is flanked on two sides by rows of houses. A passageway leads to the impressive façade with a gothic portal. Above the portal is a big window, decorated with an artistic tracery. The façade pillars support a gallery, which connects the two corner towers. A splendidly shaped triangular gable, decorated with points and a stone cross and a copper sculpture of the Virgin Mary, stands in between the towers. Both towers have, on their eaves, richly decorated balustrades, which connect four little corner towers.

On the north side is a very beautiful gothic portal. Its consoles, canopies and foliage, and especially the relief representing Christ's torture, are truly masterpieces. In the first pillar on the right is a tombstone of the Danish astronomer Tycho de Brahe. He was active in Prague and also died here in the year 1601. His remains are kept in the crypts.

Tın Cathedral is still a centre for believers and the focus for many visitors, admiring the building art of the past.