Spent way too long on this but I built an interactive map of New York City locations from the 1880s Gilded Age.

Each pin has a then vs now photo slider so you can compare what the location looked like in the 1880s to what's there today. Some of the changes are insane — Mrs. Astor's mansion at 5th & 34th is now the Empire State Building, the original Madison Square Garden is completley gone, and the Academy of Music on 14th St is now an NYU dorm.

here's the link https://gildedagemap.com/