History is a vast early warning system.
The Mongol Rally is not just an opportunity for adventure and serendipity. The nature of this 10,000-mile journey from Britain to Mongolia means ralliers can immerse themselves in diverse cultures and histories.
This leads to the possibility of taking in sites of immense historical importance. Places that can force you to stop in your tracks and think deeply. On Wednesday, Day 5, my experience was about coming face to face with unspeakable pain, suffering and pure evil.
I stayed the night in Krakow, Poland, a magnificent city. The main square in old town is vibrant and full of life. The residents are friendly and welcoming. That puts Krakow on the "must" list for me.