Geologic map and sections of Manhattan Island, State of New York (1898) (all images via New York Public Library Map Division) One of the more intriguing items is a geologic map of Manhattan from 1898, ...

Over the years, we've covered a few Raspberry Pi plane tracking projects and even one project to track the London Underground but this is the first Manhattan subway train tracker we've come across.

The interactive map documents a 10-fold increase in community land trusts in New York City since the early '90s. (Image courtesy New Economy Project) This is your first of three free stories this ...