Secret of the Incas

Secret of the Incas is a 1954 adventure film starring Charlton Heston as adventurer Harry Steele, on the trail of an ancient Incan artifact. Shot on location at Machu Picchu in Peru, the film is often credited as the inspiration for Raiders of the Lost Ark. The supporting cast features Robert Young and Thomas Mitchell.

When Romanian defector Elena Antonescu Maurey arrives, Harry apparently agrees to help her travel to Mexico so she can then get to America, but in reality he uses her situation to his own advantage. Together with Elena, he steals a plane used by a Romanian official who is attempting to get Elena to return and uses it to fly to Machu Picchu.There he discovers an archaeological expedition headed by Dr Moorehead Young is preparing to enter the tomb where the Sunburst is said to be located. Moorehead becomes infatuated with Elena, while Morgan arrives and coerces Harry into helping him find the treasure. While Morgan is asleep, Harry slips away and enters the tomb, locating the Sunburst hidden inside a hollow pillar. ........

Source: Wikipedia