The University of Amsterdam operates the city's botanical garden. Though it's rather small, it's conveniently located between the Joods Historisch Museum and Artis Zoo. Established in 1638, the Hortus offers regular art exhibitions, such as sculpture gardens and other plant-related art. Its butterfly house is nothing short of spectacular. The Orangerie, a historical monument, houses a cafe with one of the loveliest terrace views in Amsterdam. Open Monday-Friday 9 am-5 pm, Saturday and Sunday 9:30 am-5 pm, till 4 pm December and January, and till 9 pm July and August. 6 euros adults. Plantage Middenlaan 2a (Tram 9 or 14 from Centraal Station), Amsterdam. Phone 625-9021. http://www.dehortus.nl.