Set in the northern corner of Denver’s City Park, the Denver Zoo is the city’s most visited family-friendly attraction. This 80-acre (32-hectare) site is home to over 700 species, including some of the world’s rarest animals, like the Amur leopard, Siberian tiger, and black rhino. Most animals live within naturalistic habitats, an idea the zoo pioneered with its construction of Bear Mountain in 1906.