  The relics of building blocks that made stellar halo and bulge are yet to be
discovered unless they were completely disrupted throughout the history of the
Galaxy. Here we suggest that about 25% of the Milky Way globular clusters have
characteristics of the remaining cores of these early building blocks rather
than genuine star clusters. They are clearly distinct from other normal
globular clusters in the presence of extended horizontal-branch and multiple
stellar populations, in mass (brightness), and most importantly in orbital
kinematics. Based on this result, a three-stage formation picture of the Milky
Way is suggested, which includes early mergers, collapse, and later accretion.
