My favourite Garry's Mod maps, part 1

I don't often play Garry's Mod online, but I often test out maps in single player to help inspire me for my own maps. Here are some of my favourites:

gm_atomic

This map is very beautiful, making excellent use of a 3D skybox to create an enormous looking landscape. There are several buildings and a large networks of tunnels to explore. There's space for building without it feeling tacked on, and the map is also useful for machinima and comics.

gm_bigcity

Made by the same person as gm_atomic, this map is a lot less pretty, but it has to be considering the sheer scale. This pretty much pushes Source to the max. It's enormous, and a lot of fun to build or race in. It makes good use of levels, with sewers, a raised highway and the city streets. Another map useful for machinima and comics.

gm_construct_flatgrass

In my opinion the ultimate construct map. It has space to build planes, trains, boats and cars, and much more. I know garrysmod.org is flooded with construct and flatgrass remakes, but this one really is worth downloading.

Some good places for tutorials

When I started out as a mapper, like a lot of people I turned to YouTube, and found 3kliksphilip. There's a lot of hate surrounding this guy, and I admit that as I become more experienced I find better ways to do things than he does, but he helped me start mapping and for that I am grateful.

There are, however many other places I've found that can help with mapping:

Half-Wit 2 has a wealth of tutorials, from beginner to advanced, and it serves as a good place to get started.
Interlopers also has a lot of tutorials, covering slightly more varied topics than Half-Wit, but less geared towards beginners.
The Source Wiki serves as a good place to go if you need more details on specific entities, but is lacking in tutorials.
Finally, Facepunch's Mapping board, specifically the Mapper's Encyclopedia thread, is a good place to ask questions. You can also post works-in-progress in the map pimpage thread.

There are many other resources out there, but these are the ones that have helped me the most.

Good luck and happy mapping!