Once marked as a harem wife, never free in life.

Maybe that grave was once marked with a light roof structure.

Unambiguity - a given edge in the image should only be marked once.

The points that had once marked the equator became the north and south poles.

This sign dates back to 1860 and once marked the entrance to the cemetery.

Once marked for demolition, it has been saved and restored.

He had carried a sword marked like that once.

"The deer never escapes the lion, once marked for the kill."

Huge American bases once marked the landscape in several towns, bringing jobs and entertainment.

Beyond a spot that had once marked the doorway to a dilapidated building, lay a sea of debris.