Saint-Denis Cathedral is a historic church located in Saint-Denis, a suburb of Paris, France. It is known as the first major example of Gothic architecture, featuring innovative elements like ribbed vaults and flying buttresses. The cathedral was originally built in the 5th century and later rebuilt in the 12th century. The cathedral is also famous for being the burial site of many French kings and queens, making it a significant royal necropolis. Its stunning stained glass windows and intricate sculptures attract visitors from around the world, highlighting its importance in both religious and cultural history.