A zoo is a facility in which animals are kept within enclosures for public exhibition and often bred for conservation purposes.
Sea lion and keeper at the Welsh Mountain Zoo
The Tower of London housed England's royal menagerie for several centuries (Picture from the 15th century, British Library).
The Versailles menagerie during the reign of Louis XIV in the 17th century
The Tierpark Hagenbeck is a zoo in Stellingen, Hamburg, Germany. The collection began in 1863 with animals that belonged to Carl Hagenbeck Sr. (1810–1887), a fishmonger who became an amateur animal collector. The park itself was founded by Carl Hagenbeck Jr. in 1907. It is known for being the first zoo to use open enclosures surrounded by moats, rather than barred cages, to better approximate animals' natural environments.
Zoo entrance by the tropical aquarium
Wilhelm II, German Emperor during a visit on 1909, speaking with human exhibitions.
The Tierpark Hagenbeck was the first zoo to separate its animals from zoo visitors using moats instead of bars.