Recently I learnt that Andorra has no visa restrictions to its visitors (citizens of any country) and free to enter if they hold a passport or EU national identity card.
Are there any other country(ies) which have similar no visa restrictions for its visitors irrespective of citizenship?
PS: Though Andorra has not restrictions, one needs to have a multiple-entry Schengen visa, as it's a land-locked country and only be accessed via Spain or France.