It is very little, but it is a bridge.
And today it is for Louis la Vache's Sunday Bridges.
The wooden bridge crosses the dry moat around Jerusalem's Citadel, also (erroneously) called the Tower of David.
You pass through the ornamental gate, cross the bridge, and enter the Citadel.
Antiquities inside date back to the 2nd century BCE, but most of what we see today is from the Medieval period.
After the Ottoman victory in the 16th century, Sultan Suleiman the Magnificent, who also built the present Old City walls, constructed the monumental entrance.