Google announced in a tweet today that its indoor maps offering is now available from the desktop version of Google Maps. The feature was available on Android devices, but as Google notes, it's on the desktop in time for the holidays.
— Google Maps (@googlemaps) November 21, 2012
With the feature, users can view floor plans for some airports, department stores, malls, etc. The desktop version only lets you view the main level of buildings, though additional levels are available on Android.
"Depending on the data available, the map will show notable places in the building you're currently viewing, including stores, restrooms, food, and more," Google says. "Click any indoor location to learn more."
Google has an entire list of locations where the feature is available here.