Forward Time Travel: Black Holes and Wormholes are considered as the only way we will ever be able to experience time travel but this in only to travel towards the future not the past.Its like having a ferrari and volvo going to a theme park.A ferrari will travel fast and reach the destination ahead of the Volvo and enjoy more time than the volvo which will have less time as it will spend more time traveling.
Time Travel back and forth: Black Holes could be portal to different time-zones within our universe since the begining of time and and towards the end of time like parralell universes
Portal to other universes: Black Holes could be portal to different universes with different physic laws.
Exit of the Virtual World: Like whats shown in Tron.This could be a virtual world and all that comes in our and minds and what happens in this world could be directed by a user.Its like GTA,where Niko Bellic goes to sleep to freshen up but who is giving him the command,its us.same way somebody gives us command to go to sleep.
Disintegration: The end nothing else.
