So far, The Amazing Race has been to the following 81 countries in order by each season:
Continent:
North America
United States*, Mexico, Canada, Jamaica, Panama, Costa Rica
South America
Brazil, Uruguay, Argentina, Peru, Chile, Ecuador, Bolivia, Paraguay
Europe
France, Italy, United Kingdom**, Portugal, Spain, Germany, Austria, Switzerland, Netherlands, Russia****, Iceland, Norway, Sweden, Hungary, Turkey****, Greece, Finland, Ukraine, Poland, Ireland, Lithuania, Croatia, Romania, Estonia, Czech Republic, Liechtenstein, Denmark, Belgium, Azerbaijan****
Africa
South Africa, Zambia, Tunisia, Namibia, Morocco, Egypt, Kenya, Tanzania, Senegal, Ethiopia, Botswana, Mauritius, Madagascar, Mozambique, Burkina Faso, Seychelles, Ghana, Malawi
Asia
India, Thailand, China***, Malaysia, Singapore, Vietnam, South Korea, Russia****, United Arab Emirates, Philippines, Sri Lanka, Turkey****, Oman, Japan, Mongolia, Kuwait, Taiwan*****, Cambodia, Kazakhstan, Bangladesh, Indonesia, Azerbaijan****
Oceania
Australia, New Zealand
*- Includes Alaska (Seasons 1, 2, 9 & 12), Hawaii (Seasons 2-4, 6 & 11), Puerto Rico (Season 7) and Guam (Season 11)
**- Includes England (Seasons 3, 7 & 17) and Scotland (Season 3)
***- Includes Hong Kong (Seasons 2, 11 & 17) & Macau (Season 11)
****- These countries are part Asian, part European
*****- Commonly known as Republic of China, Taiwan locates the entire country
Top 15 Countries Visited:
1. United States (All 21 seasons)
2. India (10 seasons - 1, 4, 5, 7, 10, 12, 13, 14, 18, 20)
3.China (10 seasons - 1, 2, 6, 10, 11, 14, 16, 17, 18, 21)
4. Germany (7 seasons - 3, 6, 9, 14, 16, 19, 20)
5. Russia (6 seasons - 5, 9, 13, 14, 17, 21)
6. France (5 seasons - 1, 4, 6, 10, 16)
6. Thailand (5 seasons - 1, 2, 9, 14, 19)
6. Argentina (5 seasons - 5, 7, 11, 16, 20)
6. Italy (5 Seasons - 1, 4, 9, 12, 20)
6. Austria (5 seasons - 3, 4, 14, 18, 20)
6. Japan (5 seasons - 9, 12, 15, 18, 20)
12. Malaysia (4 seasons - 3, 4, 11, 16)
12. Australia (4 seasons - 2, 4, 9, 18)
12. Brazil (4 seasons - 2, 9, 13, 18)
12. Netherlands (4 seasons - 4, 12, 15, 21)
Season 1
Leg 1: United States >> South Africa >> Zambia
Leg 2: Zambia >> South Africa >> France
Leg 3: France
Leg 4: France >> Tunisia
Leg 5: Tunisia
Leg 6: Tunisia >> Italy
Leg 7: Italy >> India
Leg 8: India
Leg 9: India >> Thailand
Leg 10: Thailand
Leg 11: Thailand >> People's Republic of China
Leg 12: People's Republic of China >> United States
Leg 13: United States
Winnes: Rob and Brennan
Season 2
Leg 1: United States >> Brazil
Leg 2: Brazil
Leg 3: Brazil >> South Africa
Leg 4: South Africa >> Namibia
Leg 5: Namibia >> Thailand
Leg 6: Thailand
Leg 7: Thailand >> People's Republic of China
Leg 8: People's Republic of China >> Australia
Leg 9: Australia
Leg 10: Australia >> New Zealand
Leg 11: New Zealand
Leg 12: New Zealand >> United States
Leg 13: United States
Winners: Chris and Alex
Season 3:
Leg 1: United States >> Mexico
Leg 2: Mexico
Leg 3: Mexico >> United Kingdom
Leg 4: United Kingdom >> Portugal
Leg 5: Portugal >> Spain >> Morocco
Leg 6: Morocco
Leg 7: Morocco >> Germany >> Austria >> Germany
Leg 8: Germany >> Switzerland
Leg 9: Switzerland
Leg 10: Switzerland >> Malaysia >> Singapore
Leg 11: Singapore >> Vietnam
Leg 12: Vietnam
Leg 13: Vietnam >> United States
Winners: Flo and Zach
Season 4
Leg 1: United States >> Italy
Leg 2: Italy
Leg 3: Italy >> Austria
Leg 4: Austria >> France
Leg 5: France >> Netherlands
Leg 6: Netherlands >> India
Leg 7: India
Leg 8: India >> Malaysia
Leg 9: Malaysia
Leg 10: Malaysia >> South Korea
Leg 11: South Korea >> Australia
Leg 12: Australia
Leg 13: Australia >> United States
Winners: Reichen and Chip
Season 5
Leg 1: United States >> Uruguay
Leg 2: Uruguay >> Argentina
Leg 3: Argentina
Leg 4: Argentina >> Russia
Leg 5: Russia >> Egypt
Leg 6: Egypt
Leg 7: Egypt >> Kenya >> Tanzania
Leg 8: Tanzania >> United Arab Emirates
Leg 9: United Arab Emirates >> India
Leg 10: India >> New Zealand
Leg 11: New Zealand >> Philippines
Leg 12: Philippines
Leg 13: Philippines >> Canada >> United States
Winners: Chip and Kim
Season 6
Leg 1: United States >> Iceland
Leg 2: Iceland >> Norway
Leg 3: Norway >> Sweden
Leg 4: Sweden >> Senegal
Leg 5: Senegal >> Germany
Leg 6: Germany >> Hungary
Leg 7: Hungary >> France
Leg 8: France >>Ethiopia
Leg 9: Ethiopia >> Sri Lanka
Leg 10: Sri Lanka >> People's Republic of China
Leg 11: People's Republic of China
Leg 12: People's Republic of China >> United States
Winners: Freddy and Kendra
Season 7
Leg 1: United States >> Peru
Leg 2: Peru >> Chile
Leg 3: Chile >> Argentina
Leg 4: Argentina
Leg 5: Argentina >> South Africa
Leg 6: South Africa >> Botswana
Leg 7: Botswana
Leg 8: Botswana >> India
Leg 9: India >> Turkey
Leg 10: Turkey >> England
Leg 11: England >> Jamaica
Leg 12: Jamaica >> Puerto Rico >> United States
Winners: Uchenna and Joyce
Family Edition
Leg 1: New York >> New Jersey >> Pennsylvania
Leg 2: Pennsylvania >> Washington, D.C. >> Virginia
Leg 3: Virginia >> South Carolina >> Alabama
Leg 4: Alabama >> Mississippi >> Louisiana
Leg 5: Louisiana, USA >> Panama
Leg 6: Panama >> Costa Rica
Leg 7: Costa Rica >> Arizona, USA
Leg 8: Arizona
Leg 9: Arizona >> Utah
Leg 10: Utah >> Wyoming >> Montana
Leg 11: Montana, USA >> Quebec, Canada >> Ontario >> New York, USA
Winners: Linz Family
Season 9
Leg 1: United States >>Brazil
Leg 2: Brazil
Leg 3: Brazil >> Russia >> Germany
Leg 4: Germany >> Italy
Leg 5: Italy
Leg 6: Italy >> Greece
Leg 7: Greece >> Oman
Leg 8: Oman >> Australia
Leg 9: Australia
Leg 10: Australia >> Thailand
Leg 11: Thailand >> Japan
Leg 12: Japan >> United States
Winners: BJ and Tyler
Season 10
Leg 1: United States >> People's Republic of China
Leg 2: People's Republic of China >> Mongolia
Leg 3: Mongolia >> Vietnam
Leg 4: Vietnam
Leg 5: Vietnam >> India
Leg 6: India >> Kuwait
Leg 7: Kuwait >> Mauritius
Leg 8: Mauritius >> Madagascar
Leg 9: Madagascar >> Finland >> Ukraine
Leg 10: Ukraine >> Morocco
Leg 11: Morocco >> Spain
Leg 12: Spain >> France >> United States
Winners: Tyler and James
All Stars
Leg 1: United States >> Ecuador
Leg 2: Ecuador >> Chile
Leg 3: Chile
Leg 4: Chile >> Argentina
Leg 5: Argentina >> Mozambique
Leg 6: Mozambique >> Tanzania
Leg 7: Tanzania >> Poland
Leg 8: Poland
Leg 9: Poland >> Malaysia
Leg 10: Malaysia >> People's Republic of China (Hong Kong)
Leg 11: People's Republic of China (Macau)
Leg 12: People's Republic of China >> United States (Guam)
Leg 13: United States
Winners: Eric and Danielle
Season 12
Leg 1: United States >> Ireland
Leg 2: Ireland >> Netherlands
Leg 3: Netherlands >> Burkina Faso
Leg 4: Burkina Faso
Leg 5: Burkina Faso >> Lithuania
Leg 6: Lithuania >> Croatia
Leg 7: Croatia >> Italy
Leg 8: Italy >> India
Leg 9: India >> Japan
Leg 10: Japan >> Taiwan
Leg 11: Taiwan >> United States
Winners: TK and Rachel
Season 13
Leg 1: United States >> Brazil
Leg 2: Brazil
Leg 3: Brazil >> Bolivia
Leg 4: Bolivia >> New Zealand
Leg 5: New Zealand >> Cambodia
Leg 6: Cambodia >> India
Leg 7: India
Leg 8: India >> Kazakhstan
Leg 9: Kazakhstan >> Russia
Leg 10: Russia
Leg 11: Russia >> United States
Winners: Nick and Starr
Season 14
Leg 1: United States >> Switzerland
Leg 2: Switzerland >> Germany >> Austria
Leg 3: Austria >> Germany >> Romania
Leg 4: Romania >> Russia (Siberia)
Leg 5: Russia
Leg 6: Russia >> India
Leg 7: India >> Thailand
Leg 8: Thailand
Leg 9: Thailand >> People's Republic of China
Leg 10: People's Republic of China
Leg 11: People's Republic of China >> United States
Winners: Tammy and Victor
Season 15
Leg 1: United States >> Japan
Leg 2: Japan >> Vietnam
Leg 3: Vietnam
Leg 4: Vietnam >> Cambodia
Leg 5: Cambodia >> United Arab Emirates
Leg 6: United Arab Emirates
Leg 7: United Arab Emirates >> Netherlands
Leg 8: Netherlands >> Sweden
Leg 9: Sweden >> Estonia
Leg 10: Estonia >> Czech Republic
Leg 11: Czech Republic
Leg 12: Czech Republic >> United States
Winners: Meghan and Cheyne
Season 16
Leg 1: United States >> Chile
Leg 2: Chile
Leg 3: Chile >> Argentina
Leg 4: Argentina >> Germany
Leg 5: Germany >> France
Leg 6: France
Leg 7: France >> Seychelles
Leg 8: Seychelles >> Malaysia
Leg 9: Malaysia >> Singapore
Leg 10: Singapore >> People's Republic of China
Leg 11: People's Republic of China
Leg 12: People's Republic of China >> United States
Winners: Dan and Jordan
Season 17
Leg 1: United States >> England
Leg 2: England >> Ghana
Leg 3: Ghana
Leg 4: Ghana >> Sweden
Leg 5: Sweden >> Norway
Leg 6: Norway >> Russia
Leg 7: Russia
Leg 8: Russia >> Oman
Leg 9: Oman >> Bangladesh
Leg 10: Bangladesh >> People's Republic of China
Leg 11: People's Republic of China >> South Korea
Leg 12: South Korea >> United States
Winners: Nat and Kat
Unfinished Business
Leg 1: United States >> Australia
Leg 2: Australia
Leg 3: Australia >> Japan
Leg 4: Japan >> People's Republic of China
Leg 5: People's Republic of China
Leg 6: People's Republic of China >> India
Leg 7: India
Leg 8: India >> Austria
Leg 9: Austria >> Liechtenstein >> Switzerland
Leg 10: Switzerland
Leg 11: Switzerland >> Brazil
Leg 12: Brazil >> United States
Winners: Kisha and Jen
Season 19
Leg 1: United States >> Taiwan
Leg 2: Taiwan >> Indonesia
Leg 3: Indonesia
Leg 4: Indonesia >> Thailand
Leg 5: Thailand
Leg 6: Thailand >> Malawi
Leg 7: Malawi
Leg 8: Malawi >> Denmark
Leg 9: Denmark >> Germany >> Belgium
Leg 10: Belgium
Leg 11: Belgium >> Panama
Leg 12: Panama >> United States
Winners: Ernie and Cindy
Season 20
Leg 1: United States >> Argentina
Leg 2: Argentina
Leg 3: Argentina >> Paraguay
Leg 4: Paraguay >> Italy
Leg 5: Italy >> Austria >> Germany
Leg 6: Germany >> Azerbaijan
Leg 7: Azerbaijan >> Tanzania
Leg 8: Tanzania
Leg 9: Tanzania >> India
Leg 10: India
Leg 11: India >> Japan
Leg 12: Japan >> United States
Winners: Rachel and Dave
Season 21
Leg 1: United States >> China
Leg 2: China >> Indonesia
Leg 3: Indonesia
Leg 4: Indonesia >> Bangladesh
Leg 5: Bangladesh
Leg 6: Bangladesh >> Turkey
Leg 7: Turkey >> Russia
Leg 8: Russia
Leg 9: Russia >> Netherlands
Leg 10: Netherlands >> Spain
Leg 11:
Leg 12:
Winners: ??