What is the best way to find academic collaborations between two locations (e.g. Berlin and Australia) occurring within a certain field / topic? Some variety of massive, searchable, citation / co-author network map would be ideal, but the examples I can find so far seem quite limited.
You can, to some extent, use traditional publications databases for that. For example, with Web of Science:
will give you the list of publications with affiliations listing both Berlin and Australia in Chemistry. You can then skim through the list, or analyze it further, for example here by institution:
Another way to find a destination for your next holidays can be: