Zombie Escape maps in TF2 are great. They're chaotic and weird in a good way, like Warcraft 3 custom maps. Here are some screenshots of the mayhem in those maps.

A chopper which flies, zombies need to enter it in time to catch the survivors.

Inside view of the zombie chopper.

This map is glitched, or is it?

Some maps feature bosses which the survivors need to kill, this time a Demon Turtle.

In this Spongebob themed map survivors need to escape to the Krusty Krab burger restaurant.

The map has some sort of political theme.

A Pokemon themed map with rideable Pokemon, such as Lapras.

For some reason bloom is cranked up to the max in this map.

Difficult to say what is going on in this map.

TF2 players still love hats.
If you haven't tried Zombie Escape in TF2 I suggest joining an almost full server, especially during the weekend.