Mount Roraima, Guyana/Brazil/Venezuela

South America's answer to Uluru, this impressive sandstone plateau is surrounded on

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all sides by 400-meter cliffs, creating an isolated and unique ecosystem. If you want to follow in David Attenborough's footsteps (he's filmed several times here), organize a trek from the Venezuelan side. Hiking up Mount Roraima is best done from Venezuela. The Paratepui Route is the easiest for non-technical climbers and trips can be arranged from San Francisco de Yurani. www.summitpost.org Deep in the Swiss Alps the Lauterbrunnen Valley, or Lauterbrunnental, is a deep cleft cut in the topography running between steep limestone precipices. The waterfalls that dot the rift often disappear into wisps of spray before hitting bottom, and include Staubbach Falls, one of Europe’s highest unbroken waterfalls at 270 meters. Get to Lauterbrunnen, the village in the valley, by narrow-gauge train from Interlaken Ost station in the Bernese Highlands. www.myswitzerland.com