Judging from the complete lack of guesses on the last four entries in the Unidentified Earth series, and to judge from the lack of response when I mentioned closing down the series last week, I assume that the series has run its course. Oh well, it was fun while it lasted, but nothing lasts forever, right?
Anyway, to give away the last four entries: UI 69 is Chimney Rock in Nebraska. UI 70 is Newgrange, the ancient building in Ireland that aligns with the sun on the solstices; UI 71 is Taughannock Falls, near Ithaca, NY; and UI 72 is the B&O Warehouse beyond the right field wall at Camden Yards in Baltimore, MD.
And there we have it. Thanks for playing, folks!

