Across the bridge - 100 word Picture Prompt

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Deep in the mountains a small village lays hidden in a deep and lush valley.  It is a prosperous village its fields full of life, its river teaming with fish.  Its people lead simple but content lives. 
Only one path leads out, a bridge of rough hewn stone which disappears across the river into a crevice as deep as the mystery which is the bridge itself.  It has existed since before memory, its arch a feat beyond the imagination of these people.  How or why it was built is unknown.  
Today is the day the path is to be taken.