101 Dua’a: At the time of visiting a dangerous place 
According to Imam Jafar Saidq (a.s) if a person had to visit a place where he is afraid of something then he should recite the following ayat (verse):-  
Transliteration: RABBE ADKHILNI MOODKHALA SIDQIN WA AKH-RIJNI MOOKHRAJA SIDQIN VAJ"AL - LEE MIL LADOON-KA SOOLTANAN NASEERA 
“O’ My Lord! Cause me to enter a goodly entrance and cause me to go out (of) a goodly exit, and grant me from unto Thee an authority to assist (me)” 
And when that thing or person comes in front of him, he should recite the Ayatul Kursi.
Source: duas.org
Other links:
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