Signal Iduna Park (Westfalenstadion)

Built for the 1974 World Cup and expanded to 81,365 spectators for Bundesliga and Champions League fixtures, Signal Iduna Park is Germany's largest football ground. Its steep Südtribüne—the Yellow Wall—packs roughly 25,000 standing supporters behind the south goal, creating an acoustic wall that has measured peaks above 130 decibels on major European nights.