1. A computer-implemented method in a network server for enabling quick transitions to indoor map data from a base map displaying outdoor map data, the method comprising: receiving, from the client device, a request for map data for a specified geographic area and a specified zoom level; retrieving outdoor map data for the requested geographic area at the zoom level, wherein the outdoor map data corresponds to externally-visible physical entities; determining that the outdoor map data includes a map feature corresponding to a multi-floor building; determining a default floor for the multi-floor building; and providing the outdoor map data and data defining a widget to the client device in response to the request for map data for the specified geographic area and the specified zoom level, the widget including one or more of an indication of the default floor, an indication of a number of floors for the multi-floor building, a description of a bounding box for one or more floors of the multi-floor building, and names for each floor of the multi-floor building.