@Yellowstone Special,
How about an outdoor plaza?
Or, in the lobby of one of the tall buildings on the layouts of @Markf, @NYC Fan, or @Allan Miller, visible from outside through the glass?
Or, a subway station like those built so nicely by @Matt and his cohorts. Follow this link:
The New Subway Station (8/2/2012) | Matt
Or, a large station? Type "Union Station" into the OGR Forum search box. You'll get many, many grand station models that could support a working escalator, inside seen through expansive windows. Chicago, Denver, Cincinnati, etc.
Anybody else with suggestions?
Mike