For me, it's on my land (65 acres of woods). Like Yuff said, build a fire and bring some mead. Do we need a place like that? Or do we carry it with us? =)
Not really just one place.
The Norse/Germanic gods stretched from Iceland to Northern Italy. And every tribe had it's own traditions and what not. There were temples at one time, you can read about them in Germania and HR Ellis Davidson's books, but they are all gone now. We don't have a "mecca" or anything. It's wherever we are that's holy.
Holy ground? You mean there's ground that isn't holy? Where you are right now is plenty holy. Earth herself is the Goddess Nerthus. That being said, the Heathen mounds at Gamla Uppsala, Sweden are a noted holy site. Jordsvin
http://home.earthlink.net/~jordsvin
I agree with the others. A holy place is where you make it.
In the kindred I'm a part of, when we do blot we do it where ever there is space. We begin with the head Gothi who in old Icelandic blesses and makes sacred the space for the time in which we use it and to ward it from anything who is opposed to our purpose. There is no holy center in Astra.
I think there are many holy places for the people who belong to the northern gods one which comes to mind is new grange the air the ice the earth the water where living gods and every where we walk and any area you make sacred is then theirs and there energy will be there and it becomes holy