"It's an unexplored frontier."

He felt like Columbus or Armstrong, bolding setting foot on the brink of a vast and unexplored frontier.

Yet for most tourists, Queens remains an unexplored frontier.

This resentment culminated in the en-masse migration of substantial numbers of the Boers into the hitherto unexplored frontier, to get beyond the control of British rule.

McCoy understood why the ocean had truly been mankind's last unexplored frontier.

"Professional outdoor soccer is truly an unexplored frontier for American sports and corporate sponsors."

Had the humans continued their expansionism unabated, rather than pulling back from their unexplored frontier, war with the Romulan Star Empire would have been inevitable.

The importer Rémy Amérique recently - and rather recklessly - introduced four of them with the comment that "dessert wines are, seemingly, the last unexplored frontier."

Submillimetre astronomy is a relatively unexplored frontier in astronomy and reveals a Universe that cannot be seen in the more familiar visible or infrared light.

Many scientists say that more is known about the mountains and valleys on the dark side of the moon than about the ocean floor, the last unexplored frontier on earth.