Planetary gateways are a series of unstable wormholes that allow for faster-than-light travel between parallel universes. But be warned: they're not exactly... reliable.
Connecting the Milky Way to the Andromeda galaxy, but only on Tuesdays.
For the thrill-seeking traveler, who enjoys a little risk with their interdimensional adventure.
Where the laws of physics are mere suggestions, and you might just end up in a world made entirely of cheese.