On one of the nicest (and longest in terms of daylight) days of 2007, I walked about 13 miles from my home in Clifton Park to the vicinity of where my daughter lives in Troy, near the RPI campus. Naturally, I brought my camera. Part 4 shows my entrance into Troy, some distant views of downtown, the hike up the hill on which RPI is built, and a bit of the RPI campus.