underground missile silo with big interior.

i'll try

ADD A BABY DOLL STORE >:)

sure, why not

add small combine base, or a small cidadel from half life 2 with 2 to 4 floors and full of ar2 and combine energy balls and some combine soldiers around it probably a combine energy ball creator that can create combine balls you can grab with the gravity gun.

or an antlion spawning area with lots of sand and rocks around it, put some combine thumpers disabled there and some dead rebels on the floor.

idk if im going to add any combine stuff tbh i wasn't planning on it but i might do it

add an underground city of sorts

arbys

you should add more things like the cat except we should go looking to find it, but what i would like to see is an arena, just a big arena where stuff can battle. don't see a lot of those around

US marines recruitment center

Add some secrets (I have a few ideas)

If you use "painted" skybox from Flatgrass, im pretty sure map would look better.

a lab

A fountain/statue