CBS News Travel Editor Peter Greenberg know some passports are more powerful than others.

PHOTO: An Iraqi pilgrim shows his passport and ticket to Mecca as he waits for his flight to Saudi Arabi at the airport in Najaf on July 31, 2018, prior to the start of the annual Hajj pilgrimage in the holy city of Mecca. - The Hajj. (Photo credit should read HAIDAR HAMDANI/AFP via Getty Images)