Can one local map offer a lifetime of adventure? Alastair Humphreys embarks on a quest to discover the hidden marvels of his London neighborhood. As a National Geographic explorer, he has rowed across the Atlantic, biked around the world, and run a marathon in the Sahara—but he still loves to find the ordinary, wondrous things right under our noses.

Guest: Alastair Humphreys, National Geographic Explorer and author, "Local: A Search for Nearby Nature and Wildness"