Analyze Portal

You can tell whether an area contains a magic portal. If you study an area for 1 round, you know the sizes and locations of any portals in the area. Once you find a portal, you can study it. You can study only one portal at a time. Each round you study a portal, you can discover one property of the portal, in this order:

Any key or command word needed to activate the portal

Any special circumstance governing the portal's use, such as specific times when it can be activated

Whether the portal is one way or two way

Any of the usual properties 

Finally, glimpse of the area where the portal leads. You can look at the area where the portal leads for 1 round, to distance of 60feet (the spell range). You cannot combine this with additional divination magic.