25 of mankind's greatest engineering achievementsJuly 5, 2013
The Sky Tree's reinforced concrete center column is separate from the surrounding steel framing and incorporates an earthquake-resistant design similar to that used in pagoda temples. Engineers really did reach for the sky when they built the 278-meter Tokyo Sky Tree in earthquake-prone Japan, although given that the company responsible for the design is the same company behind plans for a space elevator, we think the structure will be around for a good few years. It was built on notoriously unstable reclaimed ground, but engineers used a traditional Japanese building technique known as shinbashira, which relies on one central column to counterbalance seismic waves, greatly reducing the sway. Completion date: May 22, 2012.
Credit: Courtesy JNTO
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(CNN) -- The last few months have seen a fair number of impressive construction plans announced, from Norway's intention to create the world's first shipping tunnel, to Maldives' plans for a space-age underwater hotel, to Dubai's plans for the world's biggest shopping mall.
How do these announcements stack up against what's already out there?
We've compiled 25 of what we think are some of the most impressive engineering/construction achievements to date, taking into consideration the era in which they were built and the knowledge and materials that were available to the designers.
Engineering can of course also include electronics and other micro feats -- arguably computers and smartphones are among the most successful, popular and influential pieces of engineering ever created -- but we're interested here in big, bold and brave.
Click through the gallery to see our selection, then let us know if you have any further additions in the comments.
The Palm, Dubai, UAE
There are several tour operators within Dubai offering boat tours of the Palm.
Aqueduct of Segovia, Segovia, Spain
Segovia is an easy day trip from Madrid and can be reached by both train and bus.
Great Wall of China, China
Beijing International airport is the closest airport to any point of the Great Wall of China -- it's just a short taxi ride to the section known as Badaling Great Wall and there are also regular bus services.
Taj Mahal, Agra, India
There are regular bus and train services connecting New Delhi with Agra.
Trans-Siberian railway, Russia
The full journey starts in Moscow and ends in Vladivostok, but passengers can join at numerous towns and cities en route.
Burj Khalifa, Dubai, UAE
The Burj Khalifa is located in downtown Dubai and is well-connected by public transport.
Akashi Kaikyō Bridge, Akashi Strait, Japan
The bridge is a short drive from Kobe Airport.
White Pass and Yukon Route Railroad, Canada
Excursions start from Fraser, British Columbia. The nearest airport is in Vancouver.
Tokyo Sky Tree, Tokyo
From Ueno Station (Tokyo Metro Ginza Line), transfer to the TOBU SKYTREE Line at Asakusa Station - the Skytree stop is a 14-minute journey.
International Space Station
Astronaut qualifications and a rocket.
There are regular buses to Teotihuacan from Mexico City.
Panama Canal, Panama
The Panama Canal is best explored by organized boat tour, but Panama City's Tocumen International Airport is the nearest airport.
Taipei 101, Taipei, Taiwan
Take the Taipei MRT-Bannan Line to MRT Taipei City Hall Station. From there, walk towards Xinyi Road from exit number two to Taipei 101.
Grand Canyon Skywalk, Arizona, United States
The nearest airports are Phoenix Sky Harbor Airport (PHX), or the Las Vegas Airport(LVS). It takes around two hours to drive to the Skywalk from Las Vegas, but organised tours which depart from the city are also available.
Shanghai World Financial Center, Shanghai
The building is a 20-minute walk from Dongchang Road Pier. The nearest subway station is Lujiazui Station.
Millau Viaduct, Millau, France
The nearest train station can be found in the town of Millau, which is well connected to cities and towns throughout France. The closest airport is Rodez-Marcillac -- a 25-minute drive away.
London Underground, London
London's Heathrow Airport is connected to the London underground.
Kansai Airport, Osaka, Japan
Kansai International Airport is connected to most of the major international hubs. Osaka is two hours from Tokyo on the Shinkansen bullet trains.
Hoover Dam, Arizona/Nevada, United States
The nearest airport is in Las Vegas, 32 miles away.
Great Pyramid of Giza, Egypt
There are regular bus services from the centre of Cairo and it's also just a short taxi ride.
Golden Gate Bridge, San Francisco
There are regular buses to the bridge from downtown San Francisco, Marin County and Sonoma County.
Eiffel Tower, Paris
The closest Paris Metro station to the Eiffel Tower is Champ de Mars.
Confederation Bridge, Prince Edward Island, Canada
Travel to Prince Edward Island by ferry from New Brunswick. Charlottetown Airport is the island's largest airport.
There are regular buses to the site, and it's also possible to get there by tram -- look for the "Colosseo" stop.
CN Tower, Toronto, Canada
The CN Tower is in the heart of downtown Toronto. There are regular buses to Bremner Boulevard, where the tower is located.body text here.