Four friends had a mad idea in 2012. They wanted to see how many countries they could visit in 24 hours. They managed 17 countries in Europe, narrowly breaking the former record of 16.

Australians Todd Hepworth and Philomena O’Brian, Swedish Liselott Martynenko Agerlid and Dutch Yvo Kuhling started in Bosnia and Herzegovina before crossing into Croatia, Serbia, Hungary, Romania, Slovakia, the Czech Republic, Austria, Slovenia, Italy, Germany, Liechtenstein, Switzerland, France, Luxembourg, Belgium and finally the Netherlands. The entire trip took them 23 hours and 30 minutes on June 1-2, 2012.

They started at 20:18, following six months of planning.

There are three rules to follow, according to

1. must physically stand in each country
2. must complete visits within any consecutive 24-hour period
3. must provide media evidence

So, can this record can be beaten? If so, how many countries can be done in 24 hours?