Japan has the most powerful passport according the Henley In
Japan, Singapore, Germany and South Korea retain top spots in Henley Passport Index - Japan Today
Henley & Partners - According to our 2017 Visa Restrictions Index, countries in Southeast Asia remain stable. Offering visa-free travel to 173 countries and ranked 4th overall, Singapore remains the best-performing country
Passport Index | Henley & Partners
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The most powerful passports in the world (and the least powerful) - MarketWatch