There's value for money and then there's value for money and then there's Halo: The Master Chief Collection, which plays host to 106 maps from Halo: Combat Evolved (playable online on console for the first time), Halo 2 (which now supports Forge Mode), Halo 3 and Halo 4. Most run on the original "native" engine, but some have been upgraded with new textures.
GAF user Mr Enigma has done us the favour of listing them (there are three outstanding entries, at the time of writing). Here is the only appropriate response. And here's a little gallery of shots to accompany the list. The map with the big pyramid structure on it is Ascension.
Update - I'm seeing disagreement online about whether maps for the PC versions of Halo 2 and CE will make the cut. 343's Frank O'Connor has told us that they will. "We've actually added a bunch of maps that were never available on the console versions from the PC versions, so they're in there now." We're seeking clarification, though.
Update 2 - A Microsoft spokesperson has told OXM that all maps from the PC versions of Halo 2 and CE are, indeed, included.
From Halo: Combat Evolved
Danger Canyon (PC)
Death Island (PC)
Hang 'Em High
Ice Fields (PC)
From Halo 2
Halo 2 maps remastered using a "native" Xbox One engine
From Halo 3
From Halo 4
Read more about the game(s) in our Halo: The Master Chief Collection preview.