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- Season 1 1993-12-10
- Season 2 1994-12-16
- Season 3 1995-08-20
- Season 4 1996-09-02
- Season 5 1997-08-17
- Season 6 1998-07-27
- Season 7 2000-01-03
- Season 8 2001-01-08
- Season 9 2002-01-02
- Season 10 2003-01-01
- Season 11 2004-01-16
- Season 12 2005-01-05
- Season 13 2006-01-04
- Season 14 2007-01-17
- Season 15 2008-01-07
- Season 16 2010-01-14
- Season 17 2010-10-29
- Season 18 2011-10-03
- Season 19 2013-07-16
- Season 20 2021-02-20
- Season 21 2021-07-25
- Season 22 2021-11-28
- Season 23 2022-02-16
Season 23 Episode
- Season 10 Trans-Siberian Railroad
- Season 10 Castles & Dungeons
- Season 10 Ice Road Truckers
- Season 10 Winter Warriors
- Season 10 Booby Traps
- Season 10 The Alcan Highway
- Season 10 Twin Towers of the East
- Season 10 The Mackinac Bridge
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- Season 10 Black Hawk: Night Stalker
- Season 10 Japanese Guns of WWII
- Season 10 Titanic Tech
- Season 10 Coal Mines
- Season 10 Secrets of the Acropolis
- Season 10 Machine Guns
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- Season 10 U.S. Guns of World War II
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- Season 10 T-34: Russian Victory
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- Season 10 Million Dollar Guns
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- Season 10 Nature Tech: Tsunamis
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- Season 10 Breaking the Sound Barrier
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- Season 10 Nature Tech: Tornadoes
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- Season 10 The Gunboats of Vietnam
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- Season 10 Machu Picchu
- Season 10 The PT Boats
- Season 10 The Battleships
- Season 10 Early Machine Guns
- Season 10 Smart Bombs
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- Season 10 Inviting Disaster 1: Three Mile Island
- Season 10 The Luftwaffe
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- Season 10 FBI's Crime Lab
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Modern Marvels - Season 10 Episode 55 Machu Picchu
7.93 44 minutes The engineering marvel Machu Picchu sits perched on a ridge in the Peruvian Andes. Originally built by the Incas, this magnificent structure remains a mystery. Was it an observatory? Pleasure retreat? Fortress? This program presents the most current theories.
