The Walls of Aquileia in The Fall of Rome in Age of Empires II: The Conquerors

Defensive structure is a type of building available in every game of the Age of Empires series. Rather than be used to train units or research technologies, they are used to defend their civilization from attacks, or warn it of attacks.

Generally speaking, there are three types of defensive structures: Walls, towers, and Castle-type buildings.

List of defensive structures[edit | edit source]

Age of Empires[edit | edit source]

All defensive structures are researched and upgraded from Granary:

Towers found in the campaign and the Scenario Editor:

Age of Empires II[edit | edit source]

All defensive structures are researched and upgraded at the University.

Constructable[edit | edit source]

Unconstructable[edit | edit source]

The unconstructable defensive structures can only be found in the Scenario Editor.

Age of Mythology[edit | edit source]

All defensive structures (except for fully upgraded walls) can research technologies that upgrade themselves. Towers can also research technologies that improve building Line of Sight.

Age of Empires III[edit | edit source]

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