He came down in a tremendous vol-plane from an unknown height.

There is a small upper tier of an unknown height just above the main drop.

Throughout history, both that point and the example of Leonardo's inquisitive mind have led mankind towards heights unknown even in the realms of fantasy.

When my thoughts soar to heights unknown, I create verse filled with passion.

The Yankees' payroll, which began the season at a record $92.5 million, was spiraling sky high, soaring to heights unknown to baseball management.

To the left a precipice dropped straight from unknown heights to unknown depths, with a cave's dark mouth just out of reach above him.

"Clattering, the storm descends from heights unknown" was the way the satirist Juvenal described the event.

Science has reached unknown heights, we are undergoing a communication revolution and erstwhile impenetrable problems can now be solved, but the world is no safer for it.

A pine of unknown height on a hill.

It then suddenly soared to previously unknown heights, reaching its peak in 1987 when 9,908 Julies were born.