La Rinconada, Peru

La Rinconada sits three miles in the air in Peru's mountainous Puno province, making it the highest city in the world.

The town has no running water or sewage system, and nearly 68% of the population lives below the poverty line, according to CNN.

Getting there isn't easy. La Rinconada is a six-hour ride from the nearest city on unpaved roads with no regular buses. Your best bet is to hitch a ride.