Visited countries from the UN recognized list:
Asia (48) South America (12)Europe (45)
AfghanistanParaguayLiechtenstein
North Korea BoliviaMontenegro
LaosBrazilThe Netherlands
IndonesiaPeruCroatia
UzbekistanVenezuelaBosnia and Herzegovina
NepalColombiaBulgaria
BangladeshArgentinaThe Slovak Republic
PakistanChileMoldova
VietnamGuyanaItaly
LebanonEcuadorMonaco
IndiaSurinameUkraine
KyrgyzstanUruguayRomania
Thailand The Holy See
JapanAfrica (55) Spain
KazakhstanSierra LeoneSwitzerland
The PhillipinesGuinea-BissauBelgium
TajikistanCôte d'IvoireAustria
JordanGuineaSan Marino
ChinaMoroccoCzech Republic
SyriaBurkina Faso Slovenia
IranCape VerdeGreat Britain
MalaysiaThe GambiaGermany
MyanmarTunisiaDenmark
IsraelGhanaNorway
RussiaMauretaniaFrance
Republic of KoreaSenegalPortugal
United Arab EmiratesEgyptPoland
MongoliaMaliLuxembourg
Cambodia
SomaliaMacedonia
Sri LankaAlgeriaBelarus
QatarMalawi
Hungary
East TimorGabonTurkey
SingaporeAngolaLithuania
YemenLiberiaFinland
KuwaitEthiopiaSweden
ArmeniaLibyaLatvia
Papua New GuineaSeychellesCyprus
MaldivesMadagascarEstonia
GeorgiaZimbabweAlbania
TaiwanKenya Greece
Saudi ArabiaZambiaSerbia
OmanRwandaIreland
Turkmenistan Eritrea
Andorra
BahrainBurundiMalta
AzerbaijanChadIceland
BhutanNamibia
IraqNigerNorth America (23)
BruneiBotswanaMexico
 TanzaniaPanama
Oceania (13)BeninCosta Rica
AustraliaSouth AfricaBelize
Samoa
MauritiusHonduras
Tonga LesothoGuatemala
New ZeelandSudan U.S.A.
Marshall IslandsEquatorial GuineaNicaragua
Solomon Islands Sao Tomé & PrincipeEl Salvador
NauruMocambiqueCanada
Fed. States of MicronesiaSwaziland
Antigua and Barbuda
TuvaluTogoGrenada
VanuatuComorosSaint Lucia
FijiCameroonS:t Vincent & the Grenadines
PalauUgandaThe Bahamas
KiribatiRepublic of the CongoBarbados
 DjiboutiHaiti
 Central African RepublicSaint Kitts & Nevis
 Dem. Rep. of the CongoDominica
 NigeriaDominican Republic
 South Sudan
Cuba
 SeychellesJamaica
  Trinidad and Tobago
   
The Travellers' Century Club list of countries are recognized by the world as the standard of countries and destinations that are geographically, politically or ethnologically different. This would also include:
ScotlandTurkey in AsiaSiberia
TransdniestrHong KongPalestine Occ. Territories
Western SaharaCanary IslandsAndaman-Nicobar Islands
MacaoSharjahSicily
SrpskaAland IslandsNorthern Ireland
Faroe Islands


 
Their official list consists of 300+ entities but they have no standards as of how long one must stay:
Nigeria