Dawn of the Tiberium Age (DTA) is a stand-alone mod that combines Tiberian Dawn (C&C 95) and Red Alert. While classic mode gets as close to the original game-play and balance as possible, Enhanced mode provides improved game balance and a lot of fun new stuff. DTA features many customization options for Skirmish and multiplayer (where you can play as GDI, Nod, Allies and Soviet on over 200 maps), challenging original singleplayer missions, as well as co-op missions. Since this is a stand-alone mod, you don't require anything but the mod itself to be able to play: the original game is not required.
Another new map created by Lin Kuei Ominae for DTA 1.12.
Radar from RA for waht is this here on this Great 2 playermap
It's the "switch".
Capture the left switch and the map becomes bigger to the right, giving the right player access to a big tiberium field with blossom trees.
Capture the right switch and the map becomes bigger to the left, giving this player access to a tiberium rich area.
The starting locations only have limited tiberium, so capturing the switch is necessary for long games.
It is amazingly well thought out. The fact that RA stuff is showing up also bring congruence to the whole C&C storyline.