Martin Heidegger's ‘Building, Dwelling, Thinking’ is well known to many architects. But comparatively little is known about the building in southern Germany's Black Forest where this influential work was almost certainly written. This essay describes how Heidegger's Hut came to be built and how it was configured and occupied. No plan of this little building has ever before been published. In the intellectual alignments that the hut displays, particularly at a small scale, it records physically many of the priorities that Heidegger wrote about.