I camped out at the Toccoa River campground this past weekend. There are two hornet (or possibly wasp) nests on the Toccoa River Bridge on the BMT.
When going north from Springer on the BMT, the first nest is on the upper left about 25 feet across the bridge on two cables holding up the bridge.
The second nest is on the other side of the bridge under the boardwalk. This nest is supposedly under the 4th board from the end.
When people get on the bridge and start jumping around, they stir up the hornets and get stung.
They looked like yellow jackets but people kept saying they only build nests underground.
Either way, be very careful crossing this bridge.