These are some of the extreme places I’ve been to:

Northernmost

Skjervoy, Norway, 70°2′ N

Southernmost

Ushuaia, Argentina, 54° 48′ S

Highest

El Misti, Peru, 5822m above sea level

Lowest

Dead Sea, Jordan, 410m below sea level

Hottest

Beijing, China, 40°C

Coldest

Stockholm, Sweden, -17°C
Vilnius, Lithuania, -17°C.