A 72-year-old Italian woman has embarked on an epic journey between Venice and Beijing by foot, following the path of the legendary merchant Marco Polo along the ancient Silk Road trade route. Vienna Cammarota left Venice, birthplace of Polo, on Tuesday, and will cover about 13,670 miles (22,000km) as she walks through 15 countries, with the aim of arriving in Beijing in December 2025. Cammarota has been an avid walker for more than 30 years and previously ventured across Tibet, Palestine, Israel, Patagonia and Madagascar on foot. Her most recent…