National Geographic
National Geographic: Geostories: Public Transportation
Use this interactive GeoStory to explore the major public transportation systems around the world.
Mount Holyoke College
International Relations: Theories of Imperialism
Five different theories on the subject of Imperialism, includes several historical figures for each theory and links for recommended readings on Imperialism.
Curated OER
Wikipedia: National Historic Landmarks in California: Berkeley (Ferry)
First propeller-driven ferry on the west coast; currently the main "building" of the Maritime Museum of San Diego.