SGT? That would be Self Guided Tours, or Trails, in Opensim. But kind of fun a challenge too. Each of these self-guided tours is a collection of 6 HG addresses/LMs that will take you all over the hyperverse to see things linked by a common theme like 'art destinations' (there are loads of separate tours for that, each one has the name of a color), or builds that are inspired by movies, or real places, and so on. It's not all of the builds that are out there, of course, just a sampling of the treats out there.
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| Avacon portals |
Lots of people set up HG hubs, a particularly good example was the one that late Rudy Backerly set up on Soul Grid some time ago, continuing the hard work of Spike Sols Weltraumbahnhof.
HG Safari has a rather different approach. Instead of offering lots of portals to specific places, the idea is to make grid jumping even more portable - you can grab a pack of LMs and a notecard listing the destinations, use them at a later date, pass them to a friend and so on.