The company seeking permits to mine minerals just outside the Okefenokee Swamp's vast wildlife refuge has agreed to pay a $20,000 fine to Georgia environmental regulators.
The damaged sites include churches, historic buildings, museums and monuments. A UNESCO spokesperson said they fear more sites will be added to the list, as the group works to verify the destruction.
Supporters say the tunnel will reduce noise and hide cars for visitors to the prehistoric landmark. Opponents warn of possible damage to the site which archaeologists continue to study.