This is the tomb of Vyasaraja who was the guru teacher/advisor of Krishnadevaraya of the Vijayanagara Empire. It is near Hampi. I have just got Vyasayogicharite a champu kavya by Somanatha Kavi and am planning to read it. I am also looking for travelogues and other catalogs of those times. One that I have found is the pair Paes and Nuniz. I will post further after I have details.
P.S. I took this photograph myself. Anyone is free to use it in their articles on Vyasathirtha.