What physical embodiments of portals between worlds have been imagined in sci-fi/fantasy? My starter list:
Rabbit hole (Alice)
Subtle knife (dark materials)
Wardrobe (Narnia)
Phone booth (Doctor Who)
Platform 9 3/4 (Potter)
Wormhole with gate (Stargate)
Conversation
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Magic carpet in Aladdin
Stone circles in Outlander
Jet car in buckaroo banzai
Looking glass in alice
Tornado in oz
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magic carpet doesn't go to a different world though does it? it's more like a plane

