Ahead, the grotto opened into a much larger space roofed by a vast ceiling vaulting into the darkness.

An important feature of the Roman basilica was that at either end it had a projecting exedra, or apse, a semicircular space roofed with a half-dome.

The shuttle was parked in a cavernous hangar, a vast dim gulf of space roofed by girders.

Their room was on the top floor, a tall, wide space roofed with translucent woven Entraxrln membrane, bowed like a loose tent over the supporting poles and beams.

We traversed several halls, all equally huge and windy, with rugged walls and lofty ceilings, and came at last into a vast circular space, roofed with a dome.

To the east of this grotto is a large space, now open, but once very possibly roofed, and forming a two-story basilica built against the rock on the north side, and there decorated with pilasters.