Is travel the best teacher? Karl Bushby has almost crossed the entire world on foot — and learnt numerous lessons doing so. But some think not all travel is equal.
Explorer nears home after 27-year walk
Epic wander: Bushby, now 56, was 29 when he set off on his worldwide walk. He has seen his mother only three times during his walk. Glossary
Hull - A port city in East Yorkshire, northern England.
Goliath - According to the Hebrew Bible, Goliath was a giant who fought the Israelites on the side of the Philistines. David, a young Israelite shepherd, killed Goliath with his slingshot. With their champion dead, the Philistines were routed.
Guerrilla - A type of warfare in which small groups use their mobility and knowledge of the terrain to harass much larger forces, attacking their supply lines and reconnaissance missions. The term means "little war" in Spanish.
Colombia - A country in South America with a population of just over 50 million.
Panama - A Latin American country that links Central America and South America. It has a population of 4.4 million.
Alaska - A US state in the extreme northwest of the continent of North America. It is separated from the rest of the USA by Canada.
Caspian Sea - A giant salt lake with borders in Russia, Kazakhstan, Turkmenistan, Iran and Azerbaijan.