The Instant Massive Structures mod is exactly as it sounds. You can craft a structure-placing block, put it on the ground, and a massive structure will instantly be generated in front of your eyes. All you need to do is craft the shape of your structure with related minecraft items.

You can use Instant Massive Structures to expand your Minecraft world with a variety of detailed, easy to make structures. You can can create maps in half the time with a set of pre-made structures. Whatever you want to do, Instant Massive Structres will help you get it done in less than a second.

Recipes:

Pyramid

Tower

Enchantment Room

Lighthouse

House

Giant Tree

Farmland (in crafting receipe, replace seeds by sugar canes, melon seeds or pumpkin seeds to get different types of farms)

Storehouse

Waterslide

Bunker

Prison

Rollercoaster

Skyscraper

Torch Pattern

Airplane

Boat (spawn it on the top block of the water you want to create it in)

AirBalloon

and much more…