In many parts of the world, particularly those in poverty-stricken areas or locations that are prone to natural disasters, students and teachers must find creative ways to assemble for the sake of education.
These 16 makeshift classrooms from around the world redefine traditional schooling
Education doesn't always have to take place inside a covered, well-air-conditioned school building.
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Some gather on rooftops for evening classes; others meet in caves or atop mountains.
The one thing they have in common: these makeshift classrooms redefine what traditional schooling typically looks like.
In the slum of Cite-Soleil, in Port-au-Prince, Haiti, dozens of children learn in an outdoor classroom that has been fitted with tables and desks.
In Karachi, Pakistan, students enjoy the mild nights with evening classes on the rooftops of homes or stores.
At the School on Wheels in an Indian slum outside of Hyderabad, children learn the Telugu alphabet inside a converted bus.
The settlement of Pueblo Nuevo, Mexico, makes similar use of a bus, as a boy from the "Peace Insurgents" school receives lessons on four wheels.
Afghan girls convene in the desert in Jalalabad in a seminar founded by the Bangladesh Rural Advancement Committee, the largest NGO in the world.
Meanwhile, in Kabul, a female teacher instructs a class of boys amidst the rubble of a destroyed open-air cubicle.
And about 105 miles north of Kabul, in the Afghanistan region of Sang Surakh, students cluster on a blanket to receive outdoor instruction.
Some of the most inspiring sights are refugee children still mustering the will to learn. In Beirut, Lebanon, a 10-year-old girl teaches a lesson to her fellow Syrian refugees.
And in the city of Muzaffarabad, devastated in 2005 by a 7.6-magnitude earthquake, a Kashmiri boy practices his math.
A 2008 earthquake caused similar devastation for Chinese students in the town of Mianzhu, in Sichuan province. Teachers still set up desks and a chalkboard amid the debris and fallen buildings.
Elsewhere, in southwest China's Guizhou province, students attend classes at the Dongzhong, which literally translates to "in cave."
In Kenya, young Somali refugees use long wooden planks to write verses from the Koran.
Nigeria's central state of Kogi hosted students victimized by flooding in a makeshift classroom that still included chairs organized in rows and a blackboard.
On World Literacy Day, Indian students at an open air school in New Delhi gathered to celebrate their love of reading.
In Indonesia, students in the town of Krueng Raya gather to learn outdoors as part of the Acehnese primary school.
In the village of Mawasi, along the southern Gaza Strip, Palestinian students learn in a series of converted shipping containers.