Stuttgart's Palace Square is the vibrant heart of the city, but at the same time it's a place to linger, within easy walking distance of many of the city's attractions. Palace Square is therefore Stuttgart's hub and an integral part of any stroll through town. In 2006 pictures of Palace Square went round the world, when 60 000 fans turned it into a sea of black, red and gold flags at the public screenings during the football World Cup.
https://www.stuttgart-tourist.de/en/a-schlossplatz-stuttgart-palace-square