Every two years, the people of Gia Vien village in Hue gather for the Du Tien festival, a traditional event featuring daring flag-grabbing performances that have been preserved for over 150 years.

CNN’s Ben Wedeman dives deep underground in Rome to explore the Aqua Virgo, an ancient aqueduct that continues to supply water to the Trevi Fountain and other landmarks.

Mysterion emphasizes that the festival is not just about shock value, but also a celebration of the art of the unusual. "They're they're pushing the boundaries of the human body, acts that are ...