If I may...
this subject is vast....because from meditation you can go to many other places.
Meditation opens a door or for some people many doors...
To be more exact picture like this:

• you meditate and enter in a altered state ...where you see something...that touches you. From that moment you are different, you have something "extra" (Good or bad, it doesnt matter)
  Now same thing from a scientific point of view:
• you focus (meditate) and enter in a altered state, your brain goes from radieting alfa ways to exerting delta ways ( that means deep sleep, meditation, or even coma). When you push your focus more, your brain will exert different types of radiation ways.
  But for each human there is a wall or a place that they canot see or climb.
  All I can say @alexc is be carefull what you do...because there are so many beautifull things in the night.