Their intelligence, in combination with their ability to mate year-round, is what has enabled wild pigs to evade capture and take over prairies, mountain valleys and rugged deserts from Canada to Mexico.
The U.S. Environmental Protection Agency has singled out the greater Salt Lake region as having the nation's worst air for much of January, when an icy fog smothers mountain valleys for days or weeks at a time and traps lung-busting soot.
Kigali unfolds across a series of lush mountain tops and deep valleys, with homes and businesses clinging to nearly every inch of hillside.
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Make your way to Fort Davis, Texas, and then you have a choice of fascinating drives, through mountain ranges, down valleys and through enticingly scenic towns.
And magnificent, soot-stained monasteries like Haghpat and Geghard, which was carved into the side of a mountain, still preside atop green valleys.
More than 5, 000 hectares of national park sit in virtual silence, trees arcing back and forth up and down the valleys, which stretch into mountain peaks.
It is a journey that ascends through mountain pastures towards the barren heights of the range, peering deep into valleys and gorges and up to raw and rocky mountains.
And if that were not bad enough, the Himalayan valleys act as chimneys, pumping pollutants from the Indian plains to the mountain peaks.
At 11am on 13 July 1375, dignitaries and eminent farmers from both valleys met atop the 6, 500ft Col de la Pierre St-Martin mountain pass, laid their hands together on the boundary stone and declared their peaceful intent.
The mountains in the state's northwest region roll off the southern tip of the Rocky Mountains, and a maze of mountains and valleys funnel the wind into extreme speeds by the time they pass over ridge crests and mountain tops of the Guadalupe and Davis mountains.
In turn, these massive U-shaped glacially formed valleys create a home for countless species of flora and fauna, including animals such as the much photographed mountain sheep and the elusive grizzly bear.
On the border of Spain, with the great spiky Pyrenees mountain range as backdrop, the Midi-Pyrenees is an area characterized by magnificent architecture, medieval villages, river valleys, rolling farmlands, and food that is fabulous as only the French can deliver.
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