Great Buildings

Construction
To place a great building, you need the following: The nine different blueprints of that building An amount of goods from that building's age Once you comply with the requirements, you can place the construction site. But that doesn't give you the building yet – see section Levels.
Blueprints
Every great building is a puzzle of nine pieces, which you have to collect in order to construct the building. That can be achieved in the following ways: Polish or Motivate your neighbours/guildmates, Plunder your neighbours, though chances to find something are a little lower than with polishing/motivating, Help other players construct their great buildings (see section "Donation Rewards"), Diamonds, once you found at least one blueprint of that building one of the other ways. Quests and the Treasure Hunt can also give you random blueprints Special events may feature blueprints as prizes When Polishing/Motivating/Plundering, the affected building's age defines what blueprint you might find. Example: If you motivate a pottery, a Bronze Age building, you can only find blueprints for the Statue of Zeus or the Tower of Babel – Great buildings of Bronze Age. You can also trade two duplicates in a specific Great building for one blueprint in that same Great Building (but still in a random spot) if you are still looking to get a specific spot.
Levels
Once you placed a great building, it's on level 0, like a construction site. Unlike other buildings, these don't build up themselves, but have to be constructed with the use of forge points. When the building reaches level 1, it is finally built, but can be upgraded to level 10 with forge points alone. You will then need set of blueprints to unlock levels past 10 (one set = one more level available). The higher the building's level, the more powerful the bonus becomes and the greater the amount of forge points are needed to reach the next level. Details on the forge-point costs and bonuses can be found in the respective posts of each building.

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Bronze Age

Tower of Babel Population, Goods

Statue of Zeus Military Boost

Iron Age

Colosseum Happiness, Medals

Lighthouse of Alexandria Supply Boost, Goods

Early Middle Age

Hagia Sophia Happiness, Forge Points

Cathedral of Aachen Military Boost, Coin Income

High Middle Age

St. Mark's Basilica Coin Boost, Goods

Notre Dame Happiness, Supply Income

Late Middle Age

St. Basil's Cathedral Fierce Resistance, Coin Income

Castel del Monte Military Boost, Forge Points

Colonial Age

Deal Castle Fierce Resistance, Medals

Frauenkirche of Dresden Happiness, Goods

Industrial Age

Royal Albert Hall Supply Boost, Goods

Capitol Population, Supply Income

Progressive Era

Château Frontenac Quest Boost, Coin Income

Alcatraz Happiness, Unattached Military

Modern Era

Space Needle Happiness, Coin Income

Atomium Happiness, Guild Goods

Postmodern Era

Cape Canaveral Forge Points

The Habitat Population, Coin Income

Contemporary Era

Lotus Temple Happiness, Coin Income

Innovation Tower Population, Forge Points

Tomorrow

Dynamic Tower Aid Goods, Supply Income

Voyager V1 Plunder Goods, Supply Income

Future

The Arc Contribution Boost, Guild Goods

Rain Forest Project Aid Blueprints, Goods

Arctic Future

Gaea Statue Happiness, Medals

No Age

Observatory Support Pool, Guild Goods

Temple of Relics Special Relic Rewards