 Complete the following phrase:  Some automobile cemeteries do not contain civilian vehicles such as cars and motorbikes, but specialized vehicles instead. French authorities set up a warehouse to help preserve firefighting history, storing fire engines that date back to the early 20th century. The vehicles, though covered in dust, were protected from the elements, but after an urban explorer published photographs of the site they were all moved to a new, secret location. There are also sites with numerous armoured vehicles, sometimes referred to as a tank graveyard. Another notable specialized vehicles graveyard is the race car graveyard located in North Carolina owned by NASCAR driver Dale Earnhardt Jr., which became the final resting place for cars such as Juan Pablo Montoyas 