Indoor Galleries
DoNYC
If you're feeling in the mood to see some art, Do NYC has a list of free art galleries and installations around New York City. It's updated frequently for users to see the most recent galleries/installations in the city!
GalleriesNow
For more free indoor galleries, another resource you can check out is Galleries Now. This website has a list of current galleries in New York City that are open to the public. There's also a convenient map option!
Link here: https://www.galleriesnow.net/exhibitions/new-york/
Outdoor Galleries
NYC Public Art Map and Guide
If you're looking for free outdoor art, the New York City Department of Parks and Recreation website has a page dedicated to showing all of the permanent installations at parks across all five boroughs. They too have a map option!
Link here: https://www.nycgovparks.org/art-map
Downtown Alliance
For free art installations in Lower Manhattan, you can checkout the Downtown Alliance website for updates. They also focus on showcasing green spaces that you can relax at as well.
Link here: https://downtownny.com/explore/things-to-do/public-art-green-spaces/
High Line Art
The High Line is public park that has art installations at various points all throughout the park itself. There are multiple entryways (both stairs and elevator) and you can sign up to take tours here.
Link here: https://www.thehighline.org/art/