| 1. | In 1927, the mountain was considered'unclimbable '.
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| 2. | The nearly vertical face of Belvedere was considered unclimbable.
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| 3. | The ramparts were surrounded by a ditch within which was an unclimbable fence.
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| 4. | The guides were not able to pass an unclimbable overhang that separated them from Kurz.
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| 5. | In 1968, Frost visited the Cirque of the Unclimbables in the Northwest Territories of Canada.
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| 6. | Until then the peak had been viewed as unclimbable as a result of several failed attempts.
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| 7. | Clyno continued to exhibit at every possible trials attracting attention by taking on hills previously thought unclimbable.
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| 8. | This was a significant achievement, since the mountain had been considered by many to be unclimbable.
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| 9. | It is named for explorer Zebulon Pike, who visited the area in 1806 and proclaimed the mountain unclimbable.
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| 10. | Cherry pickers are also used in mining, construction, exterior painting, and sometimes by arborists to work safely in otherwise unclimbable trees.
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