They were built using two concentric, dry-stone walls to create a hollow tower.

When we reached a crossroads I parked in a gateway, behind a dry-stone wall.

The dry-stone retaining walls are still in place and almost 120 years old.

If there was a cool breeze I would sometimes find them squatting on the lee side of a dry-stone wall.

The causeway seems likely to have been used until the construction of a dry-stone wall along its centre line in the 19th or 20th century.

It is protected by a dry-stone wall and some yew trees, which lean away from the wind.

The feeble screaming stopped abruptly as she reached the opening in the dry-stone wall.

Even the dry-stone walls are made of the dark purplish gritstone.

The dry-stone wall on the farther side looked solid and uncompromising.

The town, protected only by a dry-stone wall, surrendered within a few days, on 8 January 1746.