| 2009-2010: Energy |
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| 2008-2009: Democracy |
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| 2007-2008: Health and Society |
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| 2006-2007 |
 The European Union |
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| 2005-2006 |
 Evolution |
 The Atomic Bomb |
 The Mississippi River |
 Physical Philadelphia |
 Benjamin Franklin |
 Media Interactivity |
| 2004-2005 |
 Musical Theatre |
 The Skyscraper |
 A Sustainable Earth |
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| 2003-2004 |
 The Portrait |
 The Automobile |
 Globalization |
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| 2002-2003 |
 The Atomic Bomb |
 Frankenstein |
 The Statue of Liberty, and Liberty Itself |
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| 2001-2002 |
 Oil: Resources, Technology and Consequences |
 The Underground Railroad |
 Christmas |
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| 2000-2001 |
 Yosemite National Park |
 The Brooklyn Bridge |
 The Bhagavad-Gita |
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| 2000 |
 The Atomic Bomb |
 The Internet |