I plan $100,000 adventures for the ultra-rich. You can have a once-in-a-lifetime trip without a billionaire budget.

Oliver Browne, the founder of True Summit Adventures, takes clients on tours of the Altai Mountains in Mongolia. Courtesy of Oliver Browne Oliver Browne is the founder of a luxury travel agency who plans trips costing as much as $100,000. He has helped his clients go heli-skiing in Albania, on luxury safaris, and camel riding in Mongolia. Browne said there are more affordable way to do trips like these, if you know what to prioritize. This as-told-to essay is based on a conversation with Ol...