Assuming you have ImageFiles setup as a media type (e.g. there is a content type code file called "ImageFile") You can use an IContentRepository to get a list of the images, e.g.

var contentRepository = ServiceLocator.Current.GetInstance<IContentRepository>();

            var galleryImages = contentRepository.GetChildren<ImageFile>(Folder);

You can use a UrlResolver to get the actual Url of the image:

var urlResolver = ServiceLocator.Current.GetInstance<UrlResolver>();

foreach (var image in galleryImages)
{
     var url = urlResolver.GetUrl(image.ContentLink);
}

Or if you are in an MVC Razor View you can use the URL helper:

@Url.ContentUrl(image.ContentLink)

Thank you so much that worked like a charm!!