Wonder

The wonder is a building under the infrastructure tab that requires unspecified amounts of stone, logs, planks, iron, furniture, textiles, leather, and pillows, depending on the level of construction. Like the castle, university, wizard's guild, and arena, the wonder is built in stages, represented by a percentage that appears when you click on it. Each stage takes a month to complete when all supplies are available.

The wonder takes up a LOT of space and increases the appeal in an eight tile radius around it.

A civilization can only have one wonder. If it can maintain the wonder for 10 years, it wins the game.