All the equipment to make the journey -- headlamps, climbing gear, tents, food, amazing guides and paramedics -- were provided by the company that organizes the 3 night trek. The group size is limited to 15, the size of this MIT college reunion group. They work hard and play hard. I will be...

My son and his wife camped out for 3 nights in Vietnam's Son Doong Cave, thought to be the world's largest cave (in volume). The caverns could comfortably hold a 747 airplane. The cave has a river and a primaeval forest, and it has its own ecosystem. It was first discovered in 1990 but not...