Nelson Mandela and former U.S. President Bill Clinton look to the outside from Mandela's Robben Island prison cell in Cape Town, South Africa, in this photo from March 27, 1998.

Nelson Mandela was one of the most important leaders of 20th and 21st centuries - find out about his story here.

One of the more famous dark tourism destinations is South Africa's Robben Island. The island is now a UNESCO World Heritage site located about 7 miles off the coast of Cape Town.

ROBBEN ISLAND, South Africa -- With thousands of penguins waddling on its beaches and rich grasslands and trees covering its interior, Robben Island seems a haven of natural serenity.

ROBBEN ISLAND, South Africa, June 14 (Reuters) - A small but much-prized soccer trophy on display in a cell of Robben Island prison is a reminder of how football touched the lives of the activists ...

Police have closed the investigation into the alleged rape on Robben Island of gender activist Nomboniswe Gasa in January 1997. At the time, the alleged rape sent shockwaves through South Africa.

Nelson Mandela and former U.S. President Bill Clinton look to the outside from Mandela's Robben Island prison cell in Cape Town, South Africa, in this photo from March 27, 1998.