Turnip Rock, Michigan, USA

Just off the Michigan coast in Lake Huron is Turnip Rock, a large turnip-shaped rock-island. The unique shape is the result of thousands of years of erosion by storm waves.

Twenty-foot-high trees and other vegetation have grown at the top of the isolated rock. Just western of the rock is the “thumbnail” (or “tip of the thumb”) rock, which is the further point north on the "thumb" of Michigan.

The around area is private, so guests can only view the rock via vessel or over the freezing lake in the winter season.

Turnip Rock on winter.

Sources:
http://www-personal.umich.edu/~jensenl/visuals/album/turniprock/
http://atlasobscura.com/place/turnip-rock