The Shell Service Station, found in Winston-Salem, North Carolina, is the last of its kind. Eight in total were built around 90 years ago, with distinctive bright yellow shell-shaped buildings. While the others have since disappeared, this last remaining one was kept for the sake of history, and it's actually registered as a National Historic Place. However, the fun appearance is where all the excitement ends.
This landmark is fun to look at, but there isn't really anything to do. The building serves as a satellite office now, as well as a partial museum for Preservation North Carolina.