Felix Weis, a Berlin programmer, visited 27 countries and 50 cities in the past 18 months only spending bitcoin. He related his 18-month story in Forbes to a reporter, Laura Shin. Weis wanted to prove that bitcoin was not dead, as many people were claiming at the end of 2014.
He also believed that if bitcoin was, in fact, a world currency as advocates claimed, then someone should be able to travel the world only using bitcoin.
He made it a point to use bitcoin whenever possible, and only to use cash by exchanging bitcoin for cash. He used LocalBitcoins.com to find people to exchange local currency for bitcoin. There were cases when he had to help people get bitcoin so they could exchange his for cash when he needed it.
Weis often needed cash for hotel deposits and incidentals. His cash use ranged from 20% to 80% depending on the country. His cash use was lowest in North America, highest in Asia, and mid-way