Diablo III: Reaper of Souls

By far the biggest map I've seen in the rift. Holy balls.

 Spoiler

I got a map twice in a row that was the bridge at Rakkis' Crossing in Act III (may have spelt the name wrong), and then the ENTIRE Frozen field that's before it with a tower in the middle where you enter. It was absolutely ridiculously huge. It even has the Siegebreaker's spawn at the end (but there's no boss, just the section of the map where you fight him).

I explored the whole thing for the sake of it....and realized that the entire spawn both times was two mobs. The first time I got it it was all Imps and the exploding guys that blow up into Imps....so it was an Impfest. The second time I got it it was the Act V guys with the scythes...I forget their names, the ones that rush you.

Overall it was interesting, but those maps were way too massive for the limited spawn.

And then, as a complete reversal....this morning with my friend we got a rift that was one of those Tomb tilesets that you would find in the Oasis as a side quest...the entire thing was just a straight path that went up and to the right continuously. Over and over. It was the most boring map I've ever encountered. Actually took screenshots of this one simply because I was so baffled at it: http://imgur.com/a/MSyvN