Only the U.S. (168) and Russia (144) have more. Essential packing list: We landed in Java and drove for three days to reach Mount Ijen. While preparing for the trip, I learned that the sulfurous ...

Aang Koen is familiar with this phenomenon. The 48-year-old Indonesian owns a travel agency in Surabaya and organizes tours to Ijen. For years, his clientele was predominantly European ...