A living archive preserving history and promoting scholarship of grassroots urban space activism by researching and archiving efforts to create community spaces. They also exhibit materials that document these actions, to educate people on the political implications of reclaimed space.
I love that there's a museum dedicated to American art, founded at a time when American artists were underappreciated. The exhibitions are curated with a broad but discerning eye, and the architecture is spectacular. In my experience it's typically much quieter than the obvious choices like the Met and the MoMA - although both are remarkable, there's something I love about the scale and style of the Whitney.