Allstate Arena in Chicago. The thing above it that looks like a UFO is an airplane landing at O'Hare airport.
<a href="https://en.wikipedia.org/wiki/User:Jonrev" class="extiw" title="wikipedia:User:Jonrev">Jonrev</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
10 December 2006 (original upload date)
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons.