Last month I flew to London, landed at Heathrow, and started walking. 19 miles and 8 hours later I reached the center of town. You can read about the walk over on Polis.
Afterward I met a bunch of weirdos and spent the night in a storm drain under Hyde Park, where I finished second in the first-ever Bazalgette pull-up challenge (photo by Luca Carenzo).
But that's another story for another time.