Detroit’s downtown castle is one of the oldest structures in the city.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

This former fire tower found new life as a communications hub complete with a scenic overlook.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The unusual burial monument of Arizona's first governor.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.