The Exotic Garden or Jardin Exotique in Monaco - Monte Carlo boasts thousands of species of plants and is renowned for its cacti. Yet Monaco's Exotic Gardens is likely to be of interest to more than just a budding botanist or two. The Observatory Cave, included in the entrance fee, offers adults and kids a chance to learn more about concretions from stalactites to spaghetti-like helictites. Visit the Anthropology Museum, also located within the gardens, and gain regional archaeological insight.