So I know this is late notice, but tomorrow is the last day to see Looking In: Robert Frank's The Americans exhibition at the National Gallery of Art in Washington, DC. I stumbled upon it today while studying the architecture of the East Building by I.M. Pei. A very pleasant surprise indeed.
It's vastly easier to appreciate a photographer's work when properly presented; printed from the original negatives, matted, framed, and properly lit. Sure you can see it on the interweb or in a book, but it's surprisingly better when it's the real deal.
Go see it! Even if you're not all that into street photography, you'll enjoy it. The exhibition is on the west end of the West Building.
More info on Robert Frank
Also, I snagged this shot with my Xpan before going through the tunnel from the confusing East Building to the West Building.