Lava seems to be a popular terrain base style — perhaps the whole Mt. Doom thing is stuck in people’s minds. Here’s a tutorial that bills itself as explaining how to make lava splashes, but also has a great deal of information on how to simulate lava in general.
modeling
Making Sub Roman Houses
Here’s a post on making “sub roman” houses — the style of dwelling, however, probably covers five hundred or more years.
Making Rubble Terrain
Here’s an easy way to make rubble terrain with good looking results.
Portable DBA Boards
From The Wargaming Site is a brief description of the authors creation of a DBA battleboard.
Building A Pre Dreadnought Battleship From Scratch
Here’s a very involved tutorial on making a pre dreadnought battleship from scratch.