Hell is everything. Heaven is nothing.
The good news is that we don't last. Thank heavens! Because to continue the drama of who you are, is boring, ultimately. The universe is our friend because it kills us - and that's what friends are for.
Nirvana isn't a physical place. It is not like going to heaven. It just means no more individualized awareness, no aggregate body of experience.
Heaven is a state of awareness. Hell is a state of awareness.
The Buddhist mind is more complicated than the Christian mind. It comes up with endless heavens, endless hells, endless earths, and then we have something lower than hell. We have endless sub-realms that make hell look like Club Med and we have endless nirvana.