Under Edward I, the massive gatehouse was built to protect the castle entrance, including special protection against undermining.
The communists called the Wall an "Anti-Fascist Protection Barrier," but it wasn't built to protect its citizens; it was built to imprison them.
Instead, this was a parish "back levee," built to protect the communities from storm surge.
About 2,500 miles (4,000 km) of levees have been built to protect against floods.
Last year a coffer-dam built to protect the main dam during construction was blown up.
The teachers union is an institution built to protect the interests of itself and adults".
The East Germans claim it was built to protect them from West German invasion.
Since then, the Thames Barrier has been built, to protect London and keep the capital safe.
Originally built to protect the Florida Straits, it was later used as a military prison.
But the prison built to "protect our freedom" after 9/11 has made us no safer.
Beaches are wide, and dunes have been built to protect the borough from floods.
