The Lisbon Cathedral, also known as Sé de Lisboa, is the oldest church in the city. It was built in the 12th century and combines various architectural styles, including Romanesque, Gothic, and Baroque. The cathedral is located in the Alfama district and is a significant religious and historical landmark. Visitors can admire the stunning interior, including the rose window, the Gothic cloister, and the treasury. The cathedral also offers panoramic views of the city from its rooftop terrace.