Air date: 2012-03-15

Runtime: 46 min

Return to the 57-kilometer long high-speed rail tunnel in Switzerland's Gotthard Mountain range to see what it will take to finish the project by 2017.

Air date: 2012-03-22

Runtime: 46 min

Returning to Tenerife to check on the world's best water park which now seems destined to remain dry after numerous problems.

Air date: 2012-03-29

Runtime: 46 min

Crews race against the clock to finish an important venue and signature landmark for the 2012 London Olympics.

Air date: 2012-02-05

Runtime: 46 min

Mega Builders return to Istanbul to update the Marmaray rapid-transit project, which continues to have delays.

Air date: 2012-02-12

Runtime: 46 min

Six years after piles were pounded into the muddy bottom of San Francisco Bay the new Bay Bridge is about to be topped off.

Air date: 2012-02-19

Runtime: 46 min

Inside a famous Swedish hotel which is constructed from 10,000 tonnes of ice and 30,000 tonnes of snow, and boasts a frozen bar and cinema screen.