I'm curious how folks manage or control your party's access to portals to the various Junctures.
Do you keep a list of specific portals and who's controlling those portals?
Or do you just say "Sure, you can find a portal to the Ancient Juncture", whenever they want to go there.
In my game, I've established a few portals that the heroes know about.
Hong Kong Contemporary Juncture - The Dragons have control of a noodle shop in Hong Kong, and its back alley is a portal into the Netherworld, for those who know how to find it. The shop itself is protected by the powerful ghosts of a waitress and gangster who had a forbidden love in the 1960s and were killed by a powerful gangster.
Future Juncture - A portal to the Future Juncture exists in the domain of Huan Ken, the Thunder King, and he controls access to it, and requires payment or favors for its use. The portal itself is a cliff leading down into an endless chasm. To go through the portal, you drive (or jump) off the cliff, and when you land, you're roaring down a rocky mountainside in the desert wasteland of the Future Juncture.
Ancient Juncture - A portal to the Ancient Juncture is controlled by the Guiding Hand, opening up in an abandoned shop in Chang'an, capital city of Emperor Wu Zetian.
Past Juncture - One portal to the Past Juncture is controlled by The Dragons, leading to a cave in 1850 New Mexico, where the ancestor of one of the Dragons has established a mining empire that continues to the present day. I know there's also been a portal to the Past Juncture in China that the heroes have access to, but I don't think we ever established who it belongs to in detail.
How do you manage it in your games?