Scientists estimate that Nördlingen and the surrounding area contain approximately 72,000 tons of the gemstone. The diamonds are the result of an asteroid, which struck this area of Bavaria, a federal state in southern Germany, some 15 million years ago.
https://www.smithsonianmag.com/travel/german-town-contains-millions-diamonds-180961467/
@estherschindler it's a cool little town with a wall walk too. Worth a visit!