Secret of the Incas is a 1954 American adventure film directed by Jerry Hopper and starring Charlton Heston as adventurer Harry Steele, on the trail of an ancient Incan artifact. The supporting cast features Robert Young, Nicole Maurey and Thomas Mitchell, as well as a rare film appearance by Peruvian singer Yma Sumac. Shot on location at Machu Picchu in Peru, the film is often credited as the inspiration for Raiders of the Lost Ark.
https://en.m.wikipedia.org/wiki/Secret_of_the_Incas
This movie, being "old", is going to get five votes and two watchers but regardless, I just watched it and liked it a lot. Charlton Heston and Thomas Mitchell (the Morgan character) are fantastic as frenemies, and the story plugs along really well. It's good to finally see what Lucas' inspiration for the Indiana Jones movies was. It couldn't be clearer now.