National Museum of the US Air Force. The starboard landing gear of the sole remaining Valkyrie. What a sight! But, what is that little wheel for? Canon EOS 40D, EF-S 10-22mm f/3.5-4.5 USM lens, Speedlite 580EX II flash.
My very first day in the USA and I saw this! The surviving XB-70 Valkyrie used to be displayed outside at the Air Force Museum and from this angle her nickname 'Cecil the Seasick Sea Serpent' (after a 60's cartoon character) made sense.