Travel books abound. I love the essays and stories in the Travelers Tales series, but there are plenty of others to choose from, and plenty of advice and inspiration for those wanting to venture out solo. Also, please see the "Suggested Reading" section on individual Trek pages for my destination-specific recommendations.
Inspirational Coffee Table Books
Books About Women Travelers
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Biographies of Extreme Explorers
Travelogues from Far-Off Lands