Burial Mound Mystery
MYSTERY OF THE BURIAL MOUND
Here we have a single picture.
This picture was taken accidentally by an explorer.
Now, what kind of object is this a picture of Your mission is to solve the secret of this object.
Alright, let's begin the adventure to the solution.
Piece of Advice: burial mound shape
The picture above is a burial mound which combines a circular and a square shape.
This is called a "keyhole-shaped burial mound.