  With the aim of understanding the phase structure of nuclear matter created
in high-energy nuclear collisions at finite baryon density, a beam energy scan
program has been carried out at Relativistic Heavy Ion Collider (RHIC). In this
mini-review, most recent experimental results on collectivity, criticality and
heavy flavor productions will be discussed. The goal here is to establish the
connection between current available data and future heavy-ion collision
experiments in a high baryon density region.
