A view of Colonial Park, now Jackie Robinson Park, from the 155th Street Viaduct. The photo was clearly taken on a wet day, though no one in the photo has an open umbrella.
Note the ubiquitous window awnings to help with the summer sun/heat (pre-air conditioning).
Below is a detail of the park where the pool and bandshell are now located:
5G Towers Coming to Harlem
The city is planning on installing 9 5G towers in Harlem. As you can see on the map below, there will be a cluster near Columbia University, in Central Harlem near Marcus Garvey Park, and a pair in eastern, East Harlem.