I tried one of the world's oldest soups, a broth that's been kept simmering for 50 years by 3 generations of a family. It's now one of my favorite restaurants in Bangkok.

www.insider.com I tried one of the world's oldest soups, a broth that's been kept simmering for 50 years by 3 generations of a family. It's now one of my favorite restaurants in Bangkok.

The owner of Wattana Panich said they store the soup every night and add water and ingredients to it in the morning.