The Basilica of Saint Denis is a historic church located in Saint-Denis, a suburb of Paris, France. It is known as the burial site of many French kings and queens, making it a significant royal necropolis. The basilica was originally built in the 5th century and later transformed in the 12th century, showcasing early Gothic architecture. The church features stunning stained glass windows and intricate sculptures, reflecting the artistry of the period. It is also the first example of the Gothic style, influencing many other cathedrals, including the famous Notre-Dame de Paris. Today, the basilica is a popular tourist destination and a UNESCO World Heritage site.