Unter den Linden is a historic boulevard in the heart of Berlin, Germany. It stretches from the Brandenburg Gate to the Lustgarten park and is lined with linden trees, from which it gets its name. The avenue is home to several notable landmarks, including the Berlin State Opera, Humboldt University, and the Berlin Cathedral. Throughout its history, Unter den Linden has been a centre of cultural and political life in the city, playing host to numerous parades, demonstrations, and other events.