5 adventures for the adrenaline addict

About $4,000 per person, including hotel and airfare from Heathrow Airport

Anyone who wants to push themselves to the edge -- literally -- can do it with a week of biking and ice climbing in the foothills and glaciers of Bolivia's mountainous landscape. Upon arrival at El Alto Airport, adventure seeking travelers are whisked off to the world's highest oxygen bar, Ozone, for a quick lesson in high-altitude inhalation.

Then, after one day of mountain bike training, riders are ready to face Bolivia's 'Death Road' also known as 'the world's most dangerous road', with 800-foot drops off the side of the mountain. After conquering Death Road, bikers can experience one of the biggest downhill rides in the world - from the top of the Chacaltaya mountain down into the dense, lush jungle at the bottom of Zongo Valley - with over 14,000 feet of vertical descent.

But on this trip, what goes down must go up, and the next thrill is found on the Huayna Potosi Mountain. After another training day and a two-day ice climb, the trip finally reaches its peak at 19,975 feet.