(Photos) An icy Lake Michigan

I visited the Openlands Lakeshore Preserve at Fort Sheridan in Highland Park, Illinois on Thursday--and now you can see what America's largest lake looks like after a cold snap.

That's the look from the top of a bluff. The white strip two-thirds of the way up is ice.

But there is ice on the edge of the water too.

Frozen mushrooms? Uh, no. There are many old wooden pilings from long-vanished piers at Fort Sheridan.

A lonely tree stands guard.

The orange sign reads, "No Swimming."

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