Melenia Trump's visit to Africa could be made hard because of the past actions and words of her husband.
Former US President Barack Obama and his wife Michelle Obama in 2009 on a visit to Ghana also visited the castle.
She adds that the castle is a "special place". The first lady is visiting Africa on her first big solo worldwide trip, aiming to make child well-being the focus of a five-day, four-country tour. She spent about 10 minutes inside the dark, cramped dungeon where male slaves were housed.
Those who met her on Tuesday said they found the enigmatic former model "warm" and "gentle", although she made no speech and on Wednesday was heard largely thanking local dignitaries.
Melania, who has so far spent her time in Africa visiting children in schools and hospital patients, said the castle is 'really something that people should see and experience'. "My visit to Cape Coast castle was a solemn reminder of a time in our history that should never be forgotten".
She told Reuters the "dungeon is really something that people should see and experience" and "what happened so many years ago is really a tragedy".
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Melania's visit shall also highlight her passion for wildlife and conservation as she takes a trip to the Nairobi National Park in one of the animal orphanages where she will adopt an animal.
Photographs of the two first ladies featured on the front pages of major newspapers in Ghana while the visit was talked about on morning radio shows.
Mrs Trump receives flowers during an arrival ceremony after landing at Kotoka International Airport in Accra October 2, 2018.
Before the visit, Mrs. Trump visited nearby Emintsimadze Palace to participate in a traditional ceremony where a regional tribe leader granted her permission to tour the palace.
Mrs. Trump's final event of the first day in Africa was a private tea with Ghanaian first lady Akufo-Addo at Jubilee House, the presidential palace. Her five-day, four-nation tour will also include stops in Malawi, Kenya and Egypt.
The US First Lady cuddled some babies at the hospital, before also donating a phototherapy machine, teddy bears and assorted baby items.