If you are talking about animals, the four legged variety, it would have to be Kruger Park in RSA......brilliant beyond words.
As for the human variety, well any ER or A&E on any weekend (my heart goes out the the Dr's, nurses and others who have to deal with them). As for light entertainment, the Taiwanese Parliament is hard to beat
Without a doubt Chitwan National Park in Nepal - my whole attitude to the environment and protecting the planet completely changed on the day I saw a rhino in the wild, minding its own business. Brilliant.