Earth > Europe > Northern Europe > United Kingdom > Gibraltar
Tried hitching INSIDE Gib, on the back of the rock, some 15 years ago. No luck in 1.5 hours.
Go to the border and just stand somewhere nearby; cars will be moving slowly. Be careful not to hitchhike too close to the border as there are many Guardia Civil (police formed by Franco) and they are not really kind to hitchhikers.