The windmill is listed as a protected structure under rijksmonument number 14468.

The tower opposite the main building is also a protected structure.

As in the story about the shacks, the group members retreated to create new protected structures for the information they had to preserve.

From an early age, they are taught what precautions to take, such as seeking shelter in a protected structure like a doorway.

The enemy had surrounded them in the most protected structure around.

It also included a large facade and a tower folly which both are protected structures today.

The padlocks could damage the protected structure, the Council has said.

The brick watch tower at the intersection of the two streets is now a protected structure.

Exactly how looting continues in the bunker and other protected structures is unknown.

The most massively armored and protected mobile structures ever built by man.