You notice a lot of remarkable stuff if you just take time to look around. Two New Yorkers are doing just that in a pretty big way.
William Helmreich and Matt Green have each independently decided to walk every block of New York City in order to get to know what lies beyond the usual stomps.
Helmreich, a sociology professor, said he's walking 30 miles a week, 120 a month. Green was an engineer before he quit his job to walk the city full time. Both men have said they feel like they're paying homage to the city by taking the time to visit every one of its streets.