This one should be a good puzzle. The site where this photo was taken isn’t visible via the Google (I just checked), so you’ll have to rely upon something other than maps this time. Here are your clues:
- During the time that this structure was a viable entity, the water wasn’t stagnant.
- It’s old. Elements of it date back to the Mesozoic Era, and its history is richly intertwined with the narrative of our nation, our capital city, and our historical figures. It’s even listed in the National Register of Historic Places.
- This is so far off the beaten path that only the locals generally know about it, and it’s now scrawled with graffiti and has fallen in ruins.
So there you go. Have fun.