• Build a circular tunnel around the photon sphere.

 
• Fast forward on life.
  
  
• Create a wormhole.

Pretend we built a circular tunnel around a static black hole’s photon sphere, exactly where light can maintain orbit around a black hole. Because the light is traveling around the tube in circles, the tube appears straight to us and we can see ourselves. 

Take a friend into the tunnel. As you are facing your friend, you turn around, only to see that same friend in the distance.

Fast Forward on Life.

Wonder what Earth will look like in the future. Jump in a light speed capable spaceship and
skimming short of the event horizon of a black hole, taking advantage of the time dilation around
black holes. Then come back to Earth a few million years later, not a day older.

Create a Wormhole.

Think of two taking two black holes that greatly curve space and thread those curvatures together
with ‘exotic’ matter that could keep the “mouths” from closing. In order to do that, exotic matter,
a negative energy density,  would have to exist and we would have to have the technology and
know how to use to keep open a wormhole.

We could then enter one end of the wormhole and exit out of the other.