A man runs inside Praid Salt Mine, north of Bucharest
A man runs inside Praid Salt Mine, 350 km (215 miles) north of Bucharest March 4, 2013. A part of the mine, located 160 meters deep and 1.3 km from the entrance, is open to tourists and is also used as therapy for respiratory problems such as bronchitis or asthma, having a highly ionized air and a higher atmospheric pressure than on the surface. REUTERS/Radu Sigheti (ROMANIA - Tags: HEALTH TRAVEL SOCIETY)