Taken in <a href="https://en.wikipedia.org/wiki/Philadelphia,_Pennsylvania" class="extiw" title="en:Philadelphia, Pennsylvania">Philadelphia, Pennsylvania</a>, in September 2003. 
The Channel 6 Zooballoon flies with passengers above the <a href="https://en.wikipedia.org/wiki/Philadelphia_Zoo" class="extiw" title="en:Philadelphia Zoo">Philadelphia Zoo</a>.
<a href="//commons.wikimedia.org/wiki/User:JVinocur" title="User:JVinocur">Jeffrey M. Vinocur</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>