The famous photo of Lunch Atop A Skyscraper.
The building looked great in the tweet so I looked for more stuff.
I saw it in 1981.
Baltimore’s Shot Tower was the tallest building in the US from 1828-1846.
The Cylburn Mansion in Baltimore is now part of an arboretum. It was in an episode of The Wire – see the Wikipedia article I linked to.
I lived in Elkins Park from 1964-1976. I never heard of this place.