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.
The first country that comes to mind is the Republic of the Maldives. Indeed according to this link no visa is required. I expect this to be the case for most "paradise-like" destinations.
If a visa is needed, the best chance to enter visa-free is if you are a Scandinavian, since most countries allow Finns, Swedes and Danes to enter without a visa (source: Economist).
Vatican city doesn't require a visa to visit its public area, mainly piazza and basilica di San Pietro, and cappella sistina.
Entering its private areas is another story though.
Like for Andorra, you still need a Schengen visa to get to Rome.
See VisaHQ's page on this. Select your citizenship, and it will indicate the visa requirements (or lack thereof) for each country.
Although governed by Norway, there are no restrictions for foreigners to enter, reside or work on Svalbard. As with most other examples here, the only practical way (except for chartered boats or flights) to get there is through Norway, for which you may need a Schengen visa.
Bahamas, Seychelles.. i have been to both and they require no visa before one can make entry.
