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Tidally-disrupted globular clusters are transformed into thin,dynamically-cold streams of stars that are extremely valuable tracers of thelarge- and small-scale distribution of mass in the Galaxy. Using data from theGaia second data release combined with Pan-STARRS photometry, we present asample of highly-probable members of the longest cold stream in the Milky Way,GD-1. The resulting map of GD-1: (1) extends the apparent length of the streamby $20^\circ$, (2) reveals plausible locations for the progenitor, (3) detectshigh-contrast gaps along the stream, and (4) indicates the existence of streammembers perturbed off the main stream track. These discoveries are onlypossible because of the exquisite astrometry from Gaia, which permits a cleanseparation of the stream from Milky Way stars. The additional length and aproper treatment of the progenitor will aid in dynamical modeling of GD-1 formapping the large-scale dark matter distribution. The complex morphology of thestream points to a turbulent history; detailed phase-space properties of theperturbed stream members could potentially constrain dark matter substructurein the Milky Way.

Off the beaten path: Gaia reveals GD-1 stars outside of the main stream