St. John's Co-Cathedral (Kon-Katidral ta' San Ġwann) is a prominent Catholic church located in the heart of Valletta, the capital of Malta. It holds the status of a co-cathedral, sharing this honor with St. Paul's Cathedral in Mdina. Built by the Knights of St. John between 1573 and 1578 and designed by the military architect Girolamo Cassar, this cathedral is one of the country's main and most visited attractions.
On the outside, the cathedral may appear austere or even ascetic, resembling a fortress more than a temple, which reflects the Order's military past and the then-recent Great Siege of Malta. However, this modest facade hides one of the most luxurious and impressive Baroque interiors in Europe. The interior was the work of Italian artist Mattia Preti, who transformed the space into a true masterpiece with intricate stone carving, painted vaults, and magnificent altars.

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The cathedral's interior is striking in its richness and detail. The floor is covered with multicolored marble tombstones, under which noble knights of the Order are buried. Inside are eight richly decorated chapels, each dedicated to different "langues" (national divisions) of the Order and their patron saints. The cathedral's main treasure is Caravaggio's masterpiece, "The Beheading of Saint John the Baptist," which is the only signed work by the great master. A visit to the cathedral is a unique opportunity to immerse yourself in the history and art of knightly Malta.