The Adventures of the Private Detective Experience exciting tasks. The outdoor tour experience, here you become the hero of history. Plays in the more than 11 hectares of flora. The botanical garden is over 150 years old and impresses with over 10,000 native and exotic plant species. The center of the garden is the Festhaus, which opened in 1864. Find out exciting information and stories about the flora of Cologne. Prove yourself in numerous minigames and puzzles as a worthy trainee at the Academy.