Tower Rock from across the lake. No one is sure if it's a natural formation; some archeologists think that it and the regular outcrop atop the hill were constructed but have weathered away over the centuries.
Approaching Tower Rock. The lake level is lower than in above scene. Although the foreground looks like flowers floating on reflective water, they merely adorn a patch of sandy ground.
Here's a shadowed back view of the tower from near the other anomalous formation.