In 2012 Paulo became the first Brazilian, first South American and first Latin American to have visited every country in the world.

What constitutes a visit to a country
Different people have different definitions of what constitutes a visit to a country. A few "travelers" get their passport stamped at emigration, leave the Arrivals gate, and then turn around and enter the Departures gate to board the same airplane! IMHO, by doing that someone is only collecting passport stamps, but never visiting a country. Traveling is not a competitive activity.

My criteria, which I think is fair and allows me to say that I've been to a country, are when all of the following have been met whenever possible:
1 - Slept at least 3 nights (neither in trains nor in buses) or spent at least 3 days (not inside a hostel/hotel, hospital, prison, airport, land border post) in the country, but preferably between one week and one month in each country when time is available and your visa allows you to.
2 - Had at least two main meals in a local eatery consisting of local dishes.
3 - Walked at least 4 hours inside a city/village.
4 - Spent at least one hour in a central public place just people-watching.
5 - Interacted with at least one local (via phone or internet doesn't count) using at least 10 words in the local language and was understood by the local person, without the help of a translation app. Counting "1 to 10" doesn't count :-)
6 - Visited at least one main market/souk.
7 - Visited at least one of their main places of religious worship.
8 - Visited at least one of their main universities.

The Best Travelers of the World
TCC (member since 1994), MTP (member since 2005), NomadMania (member since 2012)
www.reaiche.org