ARTIS Amsterdam Royal Zoo
The main purpose of ARTIS, the oldest zoo in the Netherlands, is to stimulate the care and love for nature. There are 27 historical buildings in the 140,000 m2 of the park. It's tucked away in a leafy green part of the city (the 'Plantage' District), and is a lovely place for nature lovers.
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Note: its better to spend there at least half of day - big territory and lots to see.