If I emerged out of my building to find that I'm the only survivor inside the Capital Beltway. I'd gather supplies, then explore the ruins of the Capitol Building and the White House. I'll take a gun from one of the secret service bodies. I'll have my camera timed to take a picture of me sitting in what's left of the Oval Office.
Hmmm... so the massive bunker underneath the White House was empty when the meteors started raining down... I would've thought that would've be one of the best 'basements' in the country.