Question: In addition to the Austrian passport, what is needed to gain access to 173 countries and territories?
Sentence (from "Visa requirements for Austrian citizens"): As of 1 January 2017, Austrian citizens had visa-free or visa on arrival access to 173 countries and territories, ranking the Austrian passport 4th in terms of travel freedom (tied with Belgian, British, Dutch, French, Luxembourgish, Norwegian and Singaporean passports) according to the Henley visa restrictions index.
Relevant evidence: Yes