Internet History Sourcebooks Project
Fordham University: Modern History Sourcebook: Vasco Da Gama
This site from Fordham University provides a look into the thoughts of Portuguese explorer Vasco da Gama by examining his journal entries during his voyage to India.
PBS
Pbs: American Experience: Grand Canyon: Powell's Expedition Colorado River
Part of the main feature called "Lost in the Grand Canyon," follow scientific explorer John Wesley Powell on his expedition down the Colorado River in 1869. This interactive map with its accompanying journal entries details the course of...
University of Virginia
University of Virginia: First Across the Continent: The Exploring Expedition
This 1902 work is available here from the University of Virginia. It includes illustrations and, according to the author, is taken largely from the accounts written by the explorers themselves.