First of all, thank-you for your service to the USA.
Second, you must have surprised by seeing all those skulls of those Christian martyrs stacked up on top of each other.
Yes, it was awe-inspiring and gruesome at once. That those men all died rather than give up on Jesus Christ says a lot. I believe each gained his place in Heaven that day.
I was told about it before going in the Cathedral, so knew it would be so, but still, seeing it was something.