A secret grave has been discovered beneath a famous Indiana Jones filming location

Secret graves were apparently not just part of the film set for “Indiana Jones and the Last Crusade”.

Archaeologist Josh Gates revealed on the Oct. 9 season premiere of Discovery Channel's “Expeditions Unknown” that a joint Jordanian and American team discovered a long-buried grave at the historic site where the 1989 blockbuster film was filmed, according to a press release became.

The site known as the “Treasury” in Petra, Jordan, served as the home of the Holy Grail in the film about the race against the Nazis to find the mythological cup from which Jesus drank at the Last Supper.

In the film, the chalice grants eternal life to anyone who drinks from it, as long as they do not remove it beyond the seal of the grave.

Thousands of years ago, the Nabataean kingdom carved a city into the walls of a canyon in the desert, with the treasury structure in the middle.

Since serving as a landmark in the hit film starring Harrison Ford and Sean Connery, the Treasury has become a tourist destination, attracting a million visitors each year.

A grave containing 12 skeletons was discovered in the 2,000-year-old structure after a remote sensing scan prompted crews to start digging beneath the ground. According to the press release, the project had approval from the Jordanian government.

The team was led by Professor Paul Creasman, executive director of the American Center of Research.

“We were absolutely amazed by the revelation of this hidden chamber,” Gates said in the press release. “As almost all of the tombs in Petra were found empty, this is perhaps the most significant tomb ever found in Petra and a discovery of historic proportions.

“The breakthrough could not only reveal the secrets of the aforementioned treasury, but also provide an extraordinary insight into the lives of the early Nabataeans who built Petra.”

The treasury is believed to have been a mausoleum used for burials – rather than a treasury as previously believed, the landmark's website says.

According to the website, three Nabataean tombs from the first century B.C. were also discovered under the treasury in 2003. Discovered BC.

The recent discovery also had an eerie connection to Indiana Jones and the Last Crusade.

One of the skeletons was found with a ceramic vessel that resembled the famous mug from the film.

“When we spotted what looked like a chalice, we all froze,” Gates said.

“It looked almost identical to the Holy Grail from Indiana Jones and the Last Crusade and was located in the old building directly above the tomb. It was the ultimate moment in life to imitate art.”

According to the press release, the vessel was determined to be part of a broken jug from the first century B.C. was.