Yesterday Apple updated their Maps data with more mall and airport indoor locations. To see the data simply zoom in on the area until you are in the mall or airport. If there are multiple levels you’ll have a floor selector to the right. I believe this is now the full list for the DC region:
- BWI
- The Mall in Columbia
- Arundel Mills
- Mall at Prince Georges
- Francis Scott Key Mall
- Tysons Corner Center
- Tysons Galleria
- Fair Oaks Mall
- Fashion Centre at Pentagon City
Conspicuously missing is every Westfield mall as well as Dulles airport which is far larger than BWI.