The Taj Mahal in India has been called a poem in stone, a moon-white dream, a tear on the face of humanity.

NPR: A Pilgrimage to the Taj Mahal, a 'Poem in Stone'

On one side, it reads, "Out of the mountain of despair, a stone of hope, " from Dr. King's speech, "I Have a Dream, " presented at the Lincoln Memorial, August 28, 1963.

CNN: By the numbers: Martin Luther King Jr. Day