Clustering across Physical Sites

I'll preface this with I am new to Server 2012R2 and failover clustering.

The end goal is to setup SQL 2014 AlwaysOn for a new Sharepoint setup.

Environment
Server1: MainSite
VMWare ESXi 5.1
Windows Server 2012 R2
IBM DS3500 SAN1 - Fibre

Server 2: DRSite
VMWare ESXi 5.1
Windows Server 2012 R2
IBM DS3500 SAN2 - Fibre

Firstly, is it possible to setup two servers that are in two different sites to use Windows failover clustering?  

How do you share the disk between two different hosts?

Thanks for getting me started on this.