I took this at the Palace of Versailles in France a year or so ago.  It was part of an art installation there at the time and is a huge 20 foot round concave mirror reflecting the sky and depending on the angle the palace itself (you can just see some of the palace on the top edge).  I makes for an interesting shot as though I have copy and pasted another piece of sky into the picture upside down.

Sky Mirror by Anish Kapoor at Versailles
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