text:  Washington, D.C. is a city filled with artifacts of our nation's founding. But the oldest federal monuments in the city, dating back to the 1700s, are not on any tourist maps, and many are at risk of being destroyed. Reporter Jacob Fenston went on a journey to find them. I'm in the middle row of a minivan barreling down I-295 in D.C. We pull over onto the shoulder of the freeway near the city's southern border.