From tuk-tuks to junkboats, trains, and everything in between, travel is essential whether it's going to the market or half way around the world.

Some forms of travel may seem unusual to us, but cramming into an underground tunnel may seem just as strange to others.

In Togo, West Africa, hail down an unmarked motorcycle and jump on. A motorized three-wheel rickshaw known as a tuk-tuk will get you around many Asian countries; but watch your head when getting in or you'll have a lasting bruise from the low ceiling. In many Midwest states of the U.S., it's not unlikely to see a farmer driving their tractor or lawn mower down the highway.

From arctic sled dogs to Wild West horses and desert camels, animals are still widely used as a mode of transportation across the globe. They'll get you where you need to go, just a little slower!

Overpopulation in cities around the world has led to increasingly odd ways of travel, be it piling on top of a train or making a car look like a circus act. India, with a population of 1.2 billion people, is quickly becoming the center of this type of travel as passengers crowd onto every form of transportation possible, like bicycles, trains, and rickshaws. It's a quick way to get to know someone when your unintentionally sitting on their lap.

Here's a look at some of the unusual ways people get around: