I'm not usually one for geology, but since this story's pretty close to home, I think it's worth mentioning.
Not all rocks are created equal, and the ophiolites found scattered around Baltimore are certainly unusual. They were formed about 500 million years ago in the Earth's mantle and, through complex tectonic shifts, were brought up to the surface and now sit all around the Baltimore area. The rocks were originally part of the Iapetus Ocean, which disappeared when the Appalachian Mountains were formed. They don't look like much right now, but that's simply because they've been through a lot.
I would recommend reading the article, since my knowledge of geology is pretty limited. However, there's actually a bit of a golf connection here: If you want to see some of these rare rocks that were formed in the mantle, go to Forest Park Golf Course in Baltimore. There are some sitting by the ninth green.
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