Space gate in some place
At a small park in Adachi-ku, Tokyo.
Your next stop, the Twilight Zone and so on!
It's stereographic projection of this panorama.
I got two flickr mails about "How to make it?".
I took 4 pictures with fisheye lens.
And I wraped it with hugin.
(And using Dynamic-Photo HDR to add some local contrast enhancement.)
See their tutorials and ask at equirectangular group.