Adventure travel is a type of tourism, involving exploration or travel with a certain degree of risk and which may require special skills and physical exertion. It may include activities such as mountaineering, trekking, bungee jumping, mountain biking, canoeing, scuba diving, rafting, kayaking, zip-lining, paragliding, hiking, exploring, sandboarding, caving and rock climbing.
Seventeenth-century Italian adventurer Giovanni Francesco Gemelli Careri has been one of the world's first backpackers. While people have travelled for hundreds of years with their possessions on their backs, the modern concept of backpacking can be traced, at least partially, to the Hippie trail of the 1960s and '70s,which in turn followed sections of the old Silk Road. Some backpackers follow the same trail today.