Lille Cathedral, officially known as Basilique-cathédrale Notre-Dame de la Treille, is a prominent Roman Catholic church located in Lille, France. Construction began in 1854 and was completed in 1999, blending various architectural styles, including Gothic and Neo-Gothic. The cathedral is known for its striking façade and beautiful stained glass windows. Inside, the cathedral features a large altar and a serene atmosphere, making it a popular destination for both worshippers and tourists. The building also houses several notable artworks, including sculptures and paintings that reflect its rich history and cultural significance in the region.