Age of Empires II Edit
Bridges provide land units passage over bodies of water and block ships. Bridges can neither be attacked nor even selected, and are permanently on the map. As such, they are rather terrain elements than structures (like mountains or water). Still, Bridges are owned by a player and provide the owner with their LOS of 6. Town Watch and Town Patrol do not affect Bridges. Bridges never change ownership, not even Gaia ones. They can only be placed diagonally in the Scenario Editor, not straight in north/south or east/west direction.
In The Age of Kings, the first brick Bridge was introduced, followed by the small wooden Bridge in The Forgotten. Lastly, with Rise of the Rajas, the Southeast Asian Bridge was introduced, bringing the total to three.
Age of Mythology Edit
Bridges in Age of Mythology function as a Scenario Editor-only embellishment object, according to its animation files, it was intended to be built, but not placed. The Bridge was most likely a campaign object that was used as a plot-device, and had to be built in order to cross (most likely to attack Gargarensis's forces) a area of water. It takes the appearance of a large wooden bridge.
The Bridge was most likely unfinished, as it is extremely oversized, lacks a shadow/selection box, and does not allow units to travel over it.
- Technically the Bridge in Age of Empires II does not actually allow units to cross it, but instead places unique Shallow (water tiles that allow land units to cross but not ships) tiles beneath it, this is why units cannot be placed on it in the Scenario Editor.