The place that we see is within Naruto's subconsciousness and its as a result of the Eight Tetragram pattern which is the sealing formula used by Minato to seal the Nine tails within Naruto.
According to the Wiki, When Naruto wants to speak to the Nine-Tails, he enters a subconscious plane that resembles an underground complex, with pipes running along ...
There's not a specific place he stays, it's probably the link between chakra which allows them to see each other. Whenever someone entered to see Kyuubi, they used chakra to see him. Like Minato, Sasuke, etc.
edit - sasuke used a genjutsu, my bad.
From what I've seen from a video discussing the Itachi novels, there was a retcon where Naruto actually had a normal life at first, but his Jinchuriki status was leaked by Danzo. The reason why Naruto can't recall this, is because he was too young to the remember that there was a time that he wasn't hated.
It appears an unreleased track (it's not in Shippuden Original Soundtrack 1, 2, or 3). There's an unofficial imperfect spliced version though, titled "Six paths of pain / Given Judgment".
This also plays in Shippuden episode 79 (starting at 13:56), when Hidan stabs Asuma.
This also plays in Shippuden episode 117 (starting at 11:42), when ...
I can't seem to find any official information as to where the Eight Trigrams Sealing Style originated or was based on.
However, here's a theory.
As you may know, Naruto has many influences from Buddhism and Hinduism: the Multiple Lotus Nonself Connected Cannons, The Six Paths of Pain, Formation of Ten Thousand Snakes and the Chakra, to name a few, were ...
Madara implanted the Rinnegan onto Nagato when he was very young. And this was done without Nagato's knowledge. Then the Second Shinobi War started, after a while.
After implanting the eyes, Madara waited for years to find a person who could be used as a tool. This "tool" was supposed to guide Nagato to properly use the Rinnegan at the right time, bringing ...
I believe it's an unreleased track that's commonly known as "Minato Saves Kushina" amongst fans. This one actually seems to come up here rather often! :P
There are some unofficial versions of the song floating around on YouTube, for example, here.
Okay the only way for this to make sense for the timeline to make sense is for nagato to be order then the databooks say he is or for minato to be younger but that still doesn't make sense but just say that the data books for the ages to have either never occured to narutos author when he wrote those or for the two ages to have been written by different ...
According to the Nature Transformation wiki, there are only 5 shinobi who are known to have mastered all 5 chakra elements by raw training and without the assistance of special abilities or tools.
I think the first mask is supposed to represent the mission that he was crushed under the rocks due to the creased pattern on the right side of the mask where his face was partially crushed, the second mask is to represent kamui which is the dimension switch ability of his mangankeyo sharingan, and the last mask is foreshadowing the rineesharingan ...