From Myanmar to Pakistan to Bangladesh and beyond, some 15.2 million people live as refugees, many for decades or more. Nearly half are children under the age of 18.

The United Nations established June 20 as World Refugee Day to highlight the plight of these millions driven from their countries by natural or man-made disasters.

A Tibetan refugee camp in Nepal was set up in 1960; one in Bangladesh that houses Muslims who fled Myanmar has been in operation since 1992.

The problems of refugees do not end when they return home. Re-integrating into a changed society poses its own challenges.

Here is a gallery of photos of refugees from around the world.