Bob Perry is a Bostonian with a job he loves… mapping out the location of unmarked graves using a technology called GPR… Ground Penetrating Radar. He’s now working the historic Congressional Cemetery in Washington, DC, final resting place of Civil War photographer Matthew Brady, John Philip Sousa, and many others. How cool is this?!
/ / They Call Him The “Grave Whisperer!” How GPR Is Saving A DC Cemetery.