Im just going to keep this short and simple.
Poseidon- The location depends on where the person who it is, is currently at, but that is pretty much at Fishman Island.
Pluton- I'm just going to follow the Scaling the Red Line theory and say that Pluton is located at, more specifically, below, Elbaf. Though the location of Pluton is just complete speculation.
Uranus- I believe this is what the "national treasure" is. Doflamingo said that if he had the Ope Ope no Mi with him on that day, he could have stolen the National Treasure(Uranus), which would cause chaos and allow him to take over the world. That fits the definition of an Ancient Weapon perfectly.
Raftel________________________________________________________________________________________________
I believe that Raftel and the All Blue are located inside Reverse Mountain, and the only way to find it is to be proficient with the Voice of All Things. There is a tunnel underwater that goes through Reverse Mountain that the Sea Kings use to travel across the Grand Line. Do these Sea Kings look familiar?
So how did they go through Reverse Mountain? They surely cant take the regular path that pirates take, and they couldn't have swam across the world since the Red Line would be in their way. So that means there has to be a passage large enough for Sea Kings to go through the Red Line, and I believe that the passage is located under Reverse Mountain. Not to mention the fact that Reverse Mountain looks like a giant X, and X marks the spot is a common concept when it comes to pirate stories. So this is why I believe Raftel is located inside Reverse Mountain.
Ancient Weapons
________________________________________________________________________________________________Poseidon- The location depends on where the person who it is, is currently at, but that is pretty much at Fishman Island.
Pluton- I'm just going to follow the Scaling the Red Line theory and say that Pluton is located at, more specifically, below, Elbaf. Though the location of Pluton is just complete speculation.
Uranus- I believe this is what the "national treasure" is. Doflamingo said that if he had the Ope Ope no Mi with him on that day, he could have stolen the National Treasure(Uranus), which would cause chaos and allow him to take over the world. That fits the definition of an Ancient Weapon perfectly.
Raftel
I believe that Raftel and the All Blue are located inside Reverse Mountain, and the only way to find it is to be proficient with the Voice of All Things. There is a tunnel underwater that goes through Reverse Mountain that the Sea Kings use to travel across the Grand Line. Do these Sea Kings look familiar?
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So how did they go through Reverse Mountain? They surely cant take the regular path that pirates take, and they couldn't have swam across the world since the Red Line would be in their way. So that means there has to be a passage large enough for Sea Kings to go through the Red Line, and I believe that the passage is located under Reverse Mountain. Not to mention the fact that Reverse Mountain looks like a giant X, and X marks the spot is a common concept when it comes to pirate stories. So this is why I believe Raftel is located inside Reverse Mountain.