Most of this movie "appears" to be a Spaghetti Western but at the end Alan Steel (still in great shape), starts swinging chains and tears down the Aztec/Inca temple. This isn't any different than all the previous Hercules style movies from the 1960s.
There is a nice story and strange casting blend from many countries. It is the last of its kind, so enjoy it. I first saw this on TV in 1967. There is an English version with the title of ARIZONA KID that was shown on TV. The current available copy has that English dialogue and the missing parts in Italian with English subs.
This movie was made at the end of the Sword & Sandal cycle and only include 2 minutes of Hercules type scenes.
After the Spanish conquered the Aztecs in the 1500s, a small group of Aztecs escaped north to what is now Arizona, with a vast treasure of gold. This "last tribe" built a "hidden city" in the "great stone desert" where they existed in peace until a lost map leads all the local townsfolk on a treasure hunt. The evil group, lead by Mario Petri, (the town boss), arrive at the city first before Alan Steel's good guys. They arrive at a rock face with two Golden Doors which magically open. How is that a HIDDEN CITY? Anyone could easily find the place. After the two groups try to destroy each other and run out of bullets, the Aztecs start picking them off with arrows. The filming cleverly shows the Shadow of an Aztec Warrior on a wall as he fires an arrow. Once Mario Petri gets his hands on the gold, his mind snaps and he kills the rest of his gang. With only Alan Steel (Hercules/Samson) and two friends remaining, the tribe decides to sacrifice them by throwing them into a river of molten gold. Alan shouts, "me first" and then proceeds to beat the Aztecs and tear down their city just as an earthquake strikes. They ride off through the golden doors to safety. The Princess is called INCA in the movie, which would account for the title confusion. In the cut scenes, two cowboys say "I can smell a woman 10 miles away. Which would account for that being cut. I plan to post some nice photos here on IMDB.