So it doesn't say what book/ passage you are reading from, and there are SO many Brunos in so many different books. But I'm pretty sure you are talking about The boy in the striped pajamas, and if you are they move to Poland :)
But if that's not what you are reading I'm 80% sure the answer you're looking for is Auschwitz
They had to actually collect people who were willing to go, collect enough supplies and Good, weather could have been bad, sickness, lots of people scared to go to a new land
Hadrian was emperor of the Roman Empire from 117-138 years. He was a strong ruler committed to strengthening the Empire and Hadrian oversaw many important construction projects, including the Temple of Venus, Rome and hadrian's Wall.
Hope this answers your question... Have a great day
They created the number system we use today.