This is a fun and fascinating thread. So here goes my effort at contributing: The Gesamtkonzept is a combination of zoological park, aquarium and natural history museum. The themes are Ecology, Evolution, Enrichment (for both the animal residents and the human visitors), Endangered Species and Extinction (both past and present). Layout would be on a zoogeographical basis, per Wallace, who divided land fauna into six regions, nowadays sometimes called ecozones, with aquaria placed where the major oceanic regions would be. Each of the six land regions would be divided into bioregions, or habitat areas, which would be the basic exhibit area units. As an example, the Nearctic Region would be divided into (snazzier names are still needed) the Nearctic Boreal, Western Temperate North America, the Great Plains, Eastern Temperate North America, the Arid Southwest/Northern Mexico, and the Everglades. Each bioregion exhibit or habitat area would be modeled on such zoo exhibits as Wild Asia and the Congo Gorilla Forest at the Bronx Zoo, i.e., large outdoor exhibits for display of larger mammals, birds, and even reptiles, including multi-species and predator-prey exhibits, and one or more buildings displaying smaller mammals, birds, reptiles, amphibians, fish and invertebrates, again including multi-species and predator-prey exhibits as well as nocturnal exhibits. The oceanic aquaria would include sea bird aviaries and exhibits of mammals, reptiles, amphibians and invertebrates from major islands. There would also be aquaria for a few of the world's major fresh water systems such as the Great Lakes and the Amazon system. Each building would also include museum type exhibits: (1) using fossils to explain the evolution of some of the significant animals from the bioregion; (2) explaining some of the geological history of the region and how it influenced the zoogeography; and/or (3) addressing the area's pressing ecological issues. In addition, there would be examples of art from the region featuring the animals displayed. And signs would be provided in the dominant language of the region in addition to English in an effort to show some of the "human zoogeography". Exhibit design would draw on the experience of the very best from the world's zoos so that every exhibit would be pretty much state of the art. As part of the zoogeographical lesson of the zoo, the main transportation routes would be laid out along the paths of, and named for the world's major rivers and ocean currents, so people would effectively follow the paths of the planet's waters. My rough estimate is that the zoo would need about 4,000 acres, or about six square miles, laid out roughly as a two mile by three mile oval, with the long axis east to west, sort of a living Mollweide or similar elliptical projection of the earth's surface. The corners outside the ellipse would be for parking and other transportation facilities, administration, and the main service facilities such as central supply and veterinary facilities. Counting those areas, the total size would be about 5,000 acres, or about the size of JFK airport. I'm a New Yorker, so the dream would be for the zoo to be located somewhere in the metropolitan area, to be run by a joint effort of the Wildlife Conservation Society and the American Museum of Natural History, served by one of the main commuter train lines as well as one or more major expressways. This also means designing the exhibits to function in a temperate climate. The zoo will be anchored at the four directional poles as follows: (a) at the north end, by "The Holarctic Arctic", an exhibit of the mammals and birds with a north circumpolar distribution; (b) at the south, by "Penguins, Pinnipeds, Petrels and More", the animals of Antarctica; (c) at the west end by "Darwin's Inspiration: the Galapagos Islands"; and (d) at the east end by "Oceania and the Ring of Fire". In the center of the zoo (at the equivalent of the intersection of the equator and the mid-Atlantic ridge) would be a main museum centered on the work of Wegener and of Wallace, i.e., plate tectonics/continental drift, and zoogeography. One of the inspirations for Wegener's theory was the fit between the continental edges on either side of the Atlantic, so the location is fitting (pun intended). The center line from north to south would actually have to be off center, displaced to the west to accommodate the much larger fauna of the Eastern Hemisphere compared to the Western. Next installment: detailing the bioregions/habitat exhibit areas.