Outwardly; externally.

adverb. Outwardly; externally; on the exterior.

adverb. from the exterior, from outside

adverb. on the exterior, outside

"We are all quite accustomed to seeing the Duomo of Milan or the Basilica of St. Ambrose, but here is another Milanese church which I photographed last year, which is noteworthy for its architecture both exteriorly and interiorly -- in the case of the latter, most particularly for its painted vaulting."

interiorly  

externally  outwardly