There are two kinds of traveling without the physical body.
One is astral projection. We know we are doing this when eveything looks and feels as if we are physically present. We have actually left the body. We can see there are "two" of us.
The other is remote viewing or mind travel, We know we that we are sitting in our chair. We see what we are looking at as in a dream. There is a certain disconnectedness in the visions rather than the flow if we were actually progressing along a route.
Warning: Neither is safe if snoopng around places where visitors are not welcome.