The good folks at The Flames of War have these instructions on building a Dieppe Town House. Flames of War is a commercial set of World War II miniature wargaming rules.
Wizards of the Coast has this 25mm - 28mm papermodel of a medieval cottage. You could print out a whole bunch of these and have a whole village for your miniature wargames skirmishes.
I've recently gotten into gaming with Games Workshop's Lord of the Rings miniatures wargame. One of the scenarios that I want to do is the battle for Osgiliath. To do so, I'm going to need a lot of terrain that looks like ruins. Christopher Lee has this advice on making overgrown ruins.
Here's a nice piece of wargames terrain that makes me think, for some reason, of "The Great Escape." From Steve Winter comes these instructions for making a corrugated metal hut.
This page has three paper building models of particular interest to anyone doing miniature wargames set in China, such as the Boxer Rebellion. The models are of the Pavilion Bridge, the East Gate and a two story building. They are in 1/100th scale -- perfect for 15mm. And, because they are available as JPG files, they could be easily resized for any other scale you care to use. Take a look at them. They are amazing.
Miniature Wargaming is part of the "adventure games" hobby, which includes r ole p laying and board games. Wargamers recreate battles on the tabletop with toy soldiers, like a more complicated game of chess. Models range in height from 6mm to 28mm tall, with 15mm and 25mm being the most popular. There also is a growing interest in toy soldiers and military models, such as the 1/32 and 1/35 scale plastic soldiers from Conte, and Marx.
The most popular miniature wargames are fantasy and science fiction based, such as Warhammer, Warhammer 40K, Warmachine and The Lord of the Rings. World War II games such as Flames of War and Axis and Allies are new favorites. Other favorite historical periods include Napoleonics, the American Civil War, and ancients, such as Romans or Greeks. Other gamers enjoy miniature naval wargames, recreating battles like Trafalgar, Jutland and the Coral Sea.
Hobbyists research historical periods and paint their tiny soldiers in accurate uniforms. Others develop "historically realistic" rules sets or build scale battlefield terrain using model railroad techniques.
For pictures, visit the gallery.
Some of the bigger hobby companies are Games Workshop, which produces Warhammer, Wargames Foundry and Old Glory Miniatures. Wizards of the Coast produces several lines of pre-painted miniatures games, such as the Star Wars and Dungeons and Dragons miniatures games, and a historical game with pre-painted miniatures: The new Axis and Allies game. Wizkids produces a fantasy collectable miniatures game, such as the Mage Knight and Heroclick fantasy games, the science fiction games MechWarrior and Rocketmen, as well as the quasi-historical Pirates of the Spanish Main.