Modular Set-up

I am working on building a level in 3DS Max, the idea for the level is that of a crypt.  I am setting up for the scene to be an outside, dark and dreary place leading to the inside of the crypt.  This leading down to a darker area where the bodies would be laying.  The way the level is being set up is in that of a modular setting.  To make a level modular is to make everything into set pieces that you can put together as a puzzle after you have it all modeled and textured out.  One can make multiple walls, floors, ceilings and even objects such as tombstones to be placed either together to create a closed off building, fencing, or wall.  You can even take the smaller objects and place them where you wish throughout the map, which is usually done with small things like boxes that you can find sporadically in Halo or many other games.  This is done in different games, sometimes to make multiple different levels within the same building or even in making an entire large city for the main character to travel around in.  In my sense of the crypt, I plan to have a few different walls, some columns, trees, tombstones, even doors and gates to populate my level.  With that I can set up a graveyard scene, making several markings with tombstones pointing out that there are many buried, even make a few different crypt sets that don't work to take you to another area and leaving one that is different and is where you need to go.  Having multiple possibilities that don't work and one that does is a way to keep the player immersed into the game and making it so they won’t finish too quickly.