In this region alone there are underground cities, natural rock fortresses and troglodyte caves.

This rock fortress rising 100m from the surrounding plain is quite impressive in its own right.

He settled down into his tiny rock fortress and began to check and make ready his weaponry.

The island is the remnant of a 700,000 year old volcano, mostly made of volcanic tuff, forming a massive rock fortress.

There was little of that here, upon the windswept summit of the rock fortress; few envoys or petitioners sought audience on its forbidding heights.

Cannon sounded, not British, but French mountain guns that guarded the rock fortresses.

And that one way was the bridge and causeway at Stirling, the rock fortress on the river forty miles inland from Dunedin.

His reign saw the construction of the spectacular rock fortress of Sigiriya, with its intricate water systems, ornate gardens and frescoed palaces.

His rock fortress with its ruined palace, recovered from the jungle by British colonial explorers in the 19th century, can be climbed, but not easily.

In 1792 he built a small rock fortress for his family and others to take refuge in during these attacks.