ELMINA, Ghana — It is truly stunning to look out into the Atlantic Ocean and see the beauty of the beach and waves along the coastline of this Ghanaian fishing town and then listen to them crash onto the shores below the Elmina Slave Castle.

But if you close your eyes, you also can hear the banging of chains and the rustling of the feet of slaves — bunched in groups of 400 women and 600 men — as they are held in dark, small, cramped and poorly ventilated spaces, not knowing whether they will survive this horrible ordeal and return to their tribes in this West African nation.

It's hard to fathom how such unbelievable brutality and breathtaking beauty could coexist.

After venturing out from Accra early this morning on a three-hour ride, we arrived in Elmina to tour the Elmina Slave Castle, initially built by the Portuguese. Our knowledgeable guide, Phillip, provided riveting and often sad testimony to the horrors of the trans-Atlantic slave trade, showing us the places where women were separated from men; a spot where a woman who refused to be raped by her captors was held in a ball and chain with no food until she submitted; and the holding cell where male slaves were sent to be broken of their will.

And of course, nothing signifies the finality of the slaves better than the "Door of No Return," the sliver in a stone wall or an actual door where African slaves had to crouch low to the ground as they were ushered through one by one, checked off on a sheet of paper like cattle, never to see the motherland again.

As a descendant of Africans — I've traced my DNA on my mom's side to individuals in Senegal, Guinea Bissau and Sierra Leone — it was difficult to walk through these dark and dank dungeons, imagining hundreds of men and women packed in these rooms, forced to urinate in corners of a room; having to lie beside weak or dead comrades; and forced to endure unspeakable brutality.

This was no video or history book lesson, which allows us to learn in theory, all in the relative comfort of a classroom or home. Standing here, I could smell the stench that is locked in the rocks and stand on the same spot where men, women and children died.

Did I get emotional and weep? No. I spent most of the time taking pictures and shooting video, which always allows me to remove myself emotionally from any situation. My focus was to record as much as I could. Now I can take the images back and show my family and friends so they can witness — via my trip — the reality of the most devious and diabolical act committed against mankind.

But what I witnessed with my own eyes will not be forgotten as long as I remain on this earth.

Phillip said estimates suggest that a total of 60 million Africans came through such castles, with 40 million dying in the castles or on ships, their lifeless bodies thrown into the sea without the dignity of proper burials.

One of the more stunning things we witnessed at Elmina and Cape Coast Castle was the fact that churches were built right above the slave dungeons, allowing the Portuguese, British and Dutch — it all depended on who had taken over the castle at that time — to praise and worship Jesus Christ. The Portuguese started off with the mission introducing Christ to the Ghanaians. Instead, all they really got was evil incarnate.

People of every race, creed, religion and sex should not assign these world landmarks to just old dilapidated buildings that don't require our time or attention. This is OUR history — not only African-American or African but also Caribbean, European and Asian.

It must be recognized that the world benefited from the horrible slave trade. Africans who sold their own received gunpowder, liquor and other bartered items; nations, such as the United States, were built into superpowers; fortunes were made in Europe; and its aftereffects — colonialism and Jim Crow in Africa and the United States, respectively — continued what was started more than 600 years ago.

I'll end this with a statement inscribed in stone on the walls of both castles, which aptly describes what we all should do: "In everlasting memory of the anguish of our ancestors. May those who died rest in peace. May those who return find their roots. May humanity never again perpetrate such injustice against humanity.

"We the living vow to uphold this."

Roland S. Martin is an award-winning CNN contributor and the author of "Listening to the Spirit Within: 50 Perspectives on Faith." Please visit his Web site at www.RolandSMartin.com. To find out more about Roland S. Martin and read his past columns, visit the Creators Syndicate Web page at www.creators.com.

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