Here, the rocks rose again in wild shapes, forming natural caverns and penthouses.
"Basil"
Wilkie Collins
So they drew their boats and rafts down to the sea, and, unobserved by the sentinels on the mountain who had taken shelter from the storm under their little penthouses, they would have reached the opposite shore, the mountain, and perhaps even the oasis, if some one had not warned the anchorites-and that some one was Hermas.
"The Complete Historical Romances of Georg Ebers"
Georg Ebers
How do you know whether to assault it with engines and showers of missiles, or with penthouses and shelters?
"Tacitus: The Histories, Volumes I and II"
Caius Cornelius Tacitus