Thingstätte

Thingstätte, an enormous amphitheater built in 1935 by Albert Speer for the Nazi regime. It was built for Hitler's Nazi rallies and festivals. It holds around 15,000 people and due to the acoustics of the theater, no mic is needed to hear someone speak from the stage. April 30th/May 1st is the biggest holiday in Heidelberg, thousands of people gather up on the mountain to watch fire shows and  have bonfires in Thingstätte.

Walpurgis Night is a traditional European fixed on 30th April . It was named after Saint Walburga , the memorial to the Middle Ages on the day of her canonization at the first May was celebrated. As dance into May because it has the opportunity to dance and socializing on the eve of May Day as an urban, modern hard event input into private and commercial events found.
 dtv-Red. dtv-Lexikon, vol 20, German paperback Publisher, Munich 1974, p. 7, ISBN 3-423-03070-4