One room for several portals. These all have the same goal and therefore no practical use, but it looks nice.
Unfortunately, you need a lot of Obsidian, which makes the idea more suitable for Creative mode.
Portal Room
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How does that work??
[[Nether Portal]]
You'd have to build something like that in a ghost train...
Are that a lot of nether portals next to each other? So I would have slipped during Bauem already long through a portal!
XD
To make the room useful, you can replace some of the portals with your own portals with their own destination, see also my building idea Own portal.