I have now discovered TEN Little Libraries in my neighborhood, all of them within 10 or 11 blocks of my home.   I am charmed and amazed.   Here they all are, in reverse order of my encountering them.

from Wikipedia:

Little Free Libraries are a community movement in the United States and worldwide that offers free books housed in small containers to members of the local community. They are also referred to as community book exchanges, book trading posts, pop-up libraries, and Noox (Neighbourhood bOOk eXchange), amongst other terms