The beautiful Mackinac Bridge is a marvel of engineering, a five-mile span linking Michigan's two peninsulas.

Its towers, visible for miles south on I-75, rise 552 feet above water that is nearly 300 feet deep.  Commercially, it brings the two peninsulas together.

It's been the subject of millions of snapshots in its 57 years.  The views from its deck are some of the best around, Mackinac Island and the colonial fort.

Michigan's annual Labor Day Bridge Walk will take place on Sept. 1.  There's no fee or registration required.  Start walking anytime after the governor's party begins at 7a.m.  Walkers begin in St. Ignace.  The Lansing State Journal has more on Michigan's Marvel.