I've heard that this structure is not actually a water tank. It is probably more accurately referred to as a reservoir but to my uneducated eyes it looks like a water tank so that's what I've called it. To my mind a reservoir is an open body of water, at least that's what I picture in Australia, but I can also see that an enclosed container such as this can also be a reservoir but frankly, who care! For a purely functional structure it's got some nice decoration.
As you can see from the wording above the door it was built in 1937 for the City of Baltimore Bureau of Water Supply.
There is a lovely band of chevrons running around the top of the wall just below the domed roof and the regularly spaced concrete ribs are topped with ziggurat style decoration.
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