Whilst visiting the monument in 1666, Aubrey noticed five circular cavities in the ground and noted them in his records.

Do you see a nearly circular cavity bulging twenty miles inward?

Jutting edges that look as though they were ripped or chopped face the front, surrounding the circular cavity and contrasting with its smooth, hollowed surface.

Again that protesting whine as I stepped into the circular cavity of the buttress.

With a quick jab, the punch penetrated its surface and came away with a tiny chunk of the substance lodged inside its circular cavity.

The simplest vane pump is a circular rotor rotating inside of a larger circular cavity.

The two latter somewhat resemble the two others represented here, but differ from them in not having the circular cavities in the sides.

For a moment that circular cavity seemed perfectly black.

A town built at the bottom of this circular cavity would have been utterly inaccessible.

In the plaza's center was an inverted fountain, a circular cavity into which water poured from a surrounding ring.