I'm still pretty pleased to have found this series by Clive Cussler. The main male character, Sam Fargo, reminds me of Macgyver, a television series from a long time ago. Macgyver could solve any problem with spit and string. Sam Fargo has an engineering background and uses unusual methods to solve problems. It is very entertaining.
In one of the books it mentions the Berlin Tiergarten and says it is an urban park. I looked it up because we went to the Berlin Tiergarten and it was a zoo. According to what I read when I looked it up, it's more than a zoo...as in large urban park. Who knew?