Yes, check out "Grassy Knoll" by rlconkl here:
To find other nearby synths (if people have been kind enough to tag them) on the map here: http://photosynth.net/geoexplore.aspx It's how I found rlconkl's synth for you.
If you'd like to add your "Dealy Plaza" synth to the map, just click the [Edit Synth] button below the title of your synth, go to the [Geotag] tab, search for Dealey Plaza TX, drag the pushpin onto the plaza, and click the [Save] button in the editor.
If you'd like to go the extra mile, after you add the pushpin and save its location click on the [Start Alignment] button and when the circle appears on the map, try to match up the corner of the red brick building from your synth with the outline of the building on the map. Save your edits again when you're done with this step and maybe if rlconkl will align their synth it won't be so long before we can see both synths together.