Osaka Umeda
How a handful of rival railways, subway lines, towers and underground malls grew into Osaka's Umeda monolith.
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Large Hadron Collider
The world's most powerful particle accelerator, a 27 km ring beneath the France–Switzerland border.
International Space Station
A football-field-sized laboratory orbiting Earth, continuously inhabited since 2000.
The Channel Tunnel
A 50 km undersea rail link joining England and France, opened in 1994.
Three Gorges Dam
The world's largest power station by installed capacity, spanning the Yangtze River in China.
Burj Khalifa
At 828 metres, the tallest building ever built, completed in Dubai in 2010.