Extreme Engineering

wiki: http://en.wikipedia.org/wiki/Extreme_Engineering

Season 1: 2003
Tokyo's Sky City
Subways In America / East Side Tunnel
Transatlantic Tunnel
City in a Pyramid / The Shimizu Mega-City Pyramid
Bridging the Bering Strait / The Bering Strait Bridge
Tunneling Under the Alps / Gotthard Base Tunnel
Building Hong Kong's Airport / Hong Kong International Airport
Holland's Barriers to the Sea / Maeslantkering and Oosterscheldekering storm surge barriers
Boston's Big Dig
Widening the Panama Canal / Panama Canal expansion project

Season 2: 2004
9 episodes were produced for season 2. It is also the first season produced in HDTV.
(201) Turning Torso / Turning Torso
(202) Venice Flood Gates / Venice Tide Barrier Project (MOSE Project)
(203) Container Ships / Adrian Mærsk (Maersk Line)
(204) Oakland Bay Bridge / San Francisco-Oakland Bay Bridge
(205) Iceland Tunnels / Kárahnjúkar Hydropower Project
(206) Oil Rigs / Jack up oil rigs in Louisiana
(207) Cooper River Bridge / Cooper River Bridge
(208) Millau Viaduct / Millau Viaduct
(209) Excavators / Hull-Rust-Mahoning Open Pit Iron Mine

Season 3: 2005
WagTV produced 6 episodes that were acquired by Discovery for season 3.
The Snøhvit Arctic Gas Processing Platform / Snøhvit platform / MV Blue Marlin
The El Cajon Dam / El Cajon Dam (Mexico)
Hong Kong's Cable Car / Ngong Ping 360
Woodrow Wilson Bridge / Woodrow Wilson Bridge
Gotthard Tunnel / Gotthard Base Tunnel
Dubai's Ski Resort / Ski Dubai

Season 4: 2006
Powderhouse Productions produced 6 episodes for season 4 with host Danny Forster. It currently airs under the Build It Bigger name on Discovery HD Theater.
SuperStadium / University of Phoenix Stadium
MegaTunnel / Storm Management And Road Tunnel (SMART) in Kuala Lumpur, Malaysia
Biggest Warship / USS George H. W. Bush (CVN-77)
Sakhalin Oil & Ice / Sakhalin-II
Big Easy Rebuild / Reconstruction of New Orleans
Space Tower / Madrid's Torre Espacio

Season 5: 2006
South Ferry Subway Station / The New York City Subway's new South Ferry station
World's Biggest Arch Bridge / Hoover Dam Bypass
JFK: JetBlue Terminal / Reconstruction of John F. Kennedy International Airport's Terminal 5
Stonecutters Bridge: Hong Kong / Hong Kong's Stonecutters Bridge
California Academy of Sciences / The rebuilding of the California Academy of Sciences in San Francisco, California
Hallandsås Ridge Tunnel: Sweden / Sweden's Hallandsas railway tunnel

Season 6: 2007
Building a Destroyer / Portsmouth Naval Shipyard in Maine
Fault Zone Tunnel / Freshwater pipeline to support Southern California. Watch a TBM at work.
Boot Camp / With Excavators in Boston, Massachusetts.
World's Tallest Skyscraper / Shanghai World Financial Centre
Battle Machines / To see how a M1 Abrams tank beeing maintenanced in Fort Knox, Kentucky
Coaster Build Off / Griffon a steel rollercoaster in Busch Gardens Europe and the Renegade in Valleyfair
High Risk Tower / City of Culture of Galicia