Dreams.

I had a remarkably vivid and coherent dream, although the details are fading. I'll try to describe it. A brother and sister needed to get to another world. I don't remember if they stole something or if something else happened. Their grandmother, who turned out to be a kind of good Sorceress, told them that they needed to visit several worlds and collect certain items, and that doors and arches would serve as portals. Strangely, sometimes the world changed immediately after the arch, and sometimes they had to walk a bit. They started their journey in a park, then ended up in a typical lava location, like in Oblivion or in the Arena of the Dragon from Heroes of Might and Magic. There they met their first enemies, two very tough warriors, a woman and a man. It turned out that the brother could suddenly throw fireballs, and the sister could throw ice bolts (or vice versa). But they ran away from the enemies to another location, like a coliseum. There they searched the location, found a few cool things, climbed the stairs, and went through an arch. The location was empty. Through the arch, they ended up on a green, colorful slope where a bunch of strange creatures were milling about. They went to the palace, where they seemed to grab something and saw a portal, like from Stargate, hanging in the air on the balcony, and they had to jump into it. After teleportation, it would turn off for a while, but it could transport them anywhere. Through it, they ended up in the last location, which was also a palace, but it was like a labyrinth, and the necessary artifacts were lying at the entrance, guarded. And it turned out that magic no longer worked. When they tried to steal them, the guards became alerted, and they started running through the labyrinth. Then they quickly returned, stole the artifacts, and ran away. They went to the previous location, but there everyone already knew and was in on it. We wanted to go home through the hanging portal, but a chair was thrown at us right under our noses, and it turned off. Okay, we ran on our own, through something like a mausoleum. There we met some kind of delegation, like representatives from Russia and America, and some other guy. They needed something, but we were like, "Leave us alone, we're being chased," and ran away. We climbed a slope that became almost vertical, ran through the coliseum, and on the lava field, those warriors were there again. Then it turned out that magic was working, and we blasted them with fireballs and ice bolts, but they followed us into the park. At the gate, the old woman was waiting, who hypnotized those warriors. We thanked her and gave her the artifacts that she had asked us to collect. She said that everything was fine and that she would now help us or just said that everything was fine. The end.
I also vaguely remember that there were other locations, like inside a large building with traps, tombs, a city, and something else, but I don't remember the details; I've already forgotten.
Oh, and I also had the feeling that it was all happening inside a Disney cartoon.