Blueprints
As of season three, there is a new task before being able to construct buildings at the 
Construction Sites. Due to the downfall of civilization, the 
Blueprints needed to construct just about every building must be (re)discovered. There are almost 140 construction projects to recover!
Blueprint Types
Construction Blueprint (common)- Construction Blueprint (uncommon)
Construction Blueprint (rare)
Construction Blueprint (very rare!)
How to obtain blueprints
The Blueprints can be found in many ways or by constructing other buildings.
Finding lost plans
Each 
Town starts with several "free" plans scattered in the 
World Beyond.
These Blueprints are already uncovered, so all that is required is locate them, pick them up and bring them back to the Town!
- Local towns have 3 Construction Blueprint (rare) and 1 Construction Blueprint (very rare!) hidden in the World Beyond.
- Distant regions have 5 Construction Blueprint (rare) and 2 Construction Blueprint (very rare!) hidden in the World Beyond.
Scavenging in the World Beyond
It is also possible to discover Blueprints in the World Beyond while Scavenging.
Camping in the Ruins
You can also get a blueprint by camping in 
Ruins. The "quality" of the blueprint depends on how far that building actually is from the Town. Those close to town (9km or less) give a Construction Blueprint (uncommon), while those faraway from town (10km or more) give a Construction Blueprint (rare).
Note that only one blueprint can be found per Ruin camped.
The Architect's Study
Building the 
Architect's Study will give 1 Construction Blueprint (common) to the town every new day.
Using blueprints
While in the safety of a Town, click on the blueprint when you're in your home to study it.
The project that it unlocks will automatically be added to the list of projects available at the Construction Sites and an announcement will be made in the 
Registers.