Most countries visited in 24 hours by scheduled transport
Who
Adam Leyton
What
12 total number
Where
Austria
When

The most countries visited in 24 hours by scheduled transport is 12 and was achieved by Adam Leyton (UK) from 25 to 26 May 2016.

Adam began his attempt in Perl, Germany. He then visited Luxembourg, France, Belgium, The Netherlands, Denmark, Sweden, Poland, Czech Republic, Slovakia, Hungary and Austria.