Workers removing a controversial Confederate monument in a St. Louis park made an “Indiana Jones”-like discovery — a time capsule hidden inside the 103-year-old granite landmark.

Mark Trout, director of the Missouri Civil War Museum, told Fox 2 St. Louis that workers dismantling the last pieces of the 38-foot-tall monument popped loose the waterlogged, sealed capsule.

“It was like Indiana Jones. Lifted it up and there was the box,” he said.

The museum took the city of St. Louis to court to stop its demolition of the monument. But the two sides struck a deal this week calling for its removal and reconstruction at a battlefield, cemetery or Civil War museum outside the city.

The monument will be stored until a permanent site can be found.

Critics saw the placement of the monument in a public place like Forest Park as an acceptance of racism.

Archives show the box contains documents from the Daughters of the Confederacy, which turned over ownership of the monument to the museum.

The capsule also contains at least one other item. It’s unclear yet when the capsule will be opened.

“We know the last thing put in the box was a magazine placed in there by one of the soldiers of General Pickett’s (Confederate) division at Gettysburg — the famous ‘Pickett’s Charge,’” Trout said.

“He held it up at the ceremony saying, ‘Hey look, we’re in the magazine. Put this in the box.’ When we open that box, the first thing laying on top should be the Star magazine that the soldier placed there.”

There also may be war medals and maybe something to mark the controversy that has shadowed the monument from its construction and dedication in 1914, Fox 2 reported.