I stopped at Heavener Runestone State Park on my way home from Southeastern Oklahoma this weekend. The park is there to protect a huge slab of rock containing several mysterious carved runes. This is just one of the letters, it's about eight inches across and six inches high. Two shots with the 180mm macro merged, shot through plexiglass by ambient light (there's a bit of contrast loss on the right due to a reflection on the plexiglass that I missed when shooting).
It is claimed that Viking explorers sailed down the East Coast of the USA, across the Gulf of Mexico, and up the Mississippi and Arkansas Rivers to the future home of Heavener, Oklahoma where they carved these runes (and about five other sets of runes in the general area). I don't believe a word of it, but I do think they are fascinating...I just hope they aren't a late19th Century hoax! There are scholars who claim to have translated them from Norse, but about three different translations out there.
I wish I'd backed up a little more to give the rune some breathing room, but I was in a documentary mindset of capturing as much detail as possible when I shot.
More on the Heavener Runestones here:
http://en.wikipedia.org/wiki/Heavener_Runestone
Note that they have something similar up in Minnesota!
180mm macro (two merged shots, total about 19.5 megapixels)
1.3 seconds @ f/11, ISO 100
ambient light, tripod mount (obviously!)
. However, it does make one wonder about the exploits of the Vikings. Interesting shot of the symbol though, looks like a large butterfly. 
Interesting photo and information Mike...never knew anything about it.