Front Row of Pillars. A long, low building with tall windows frames the upper plaza, keeping the focus on the circle of pillars in the middle. A 360° view from the upper plaza, where the giant pillars stand in a ring on the summit of the hill. King Vakhtang Gorgasali, the warrior king of the 5th century, is remembered as the founder of Tbilisi — legend says his falcon fell into a hot spring where the city now stands.