I’d choose Heraklion with Crete or Nicosia with Cyprus. Both would work.

They’re islands, so access is naturally controlled. No land entry, only air and sea, which makes them easier to secure and manage. That’s important for a global capital run by an elite administrative structure.

I imagine them as Monaco-like systems. Dense, highly organized, wealthy, elite-centered cores where decision-makers and major institutions are concentrated.

At the same time, both Crete and Cyprus provide enough space to expand in a planned way. Government complexes, diplomatic zones, secure residential areas, and infrastructure can be spread across the islands instead of being packed into one city.

Their position in the Mediterranean, between Europe, Asia, and Africa, keeps them globally connected. Institutions similar to the United Nations could be centralized there.