Recent 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 designers.
Many were inspired by the human impulse to travel, and those that weren't can be enjoyed by travelers today.
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 additions in the comments section.
The Palm, Dubai, UAE
Aqueduct of Segovia, Segovia, Spain
Great Wall of China, China
Taj Mahal, Agra, India
Trans-Siberian Railway, Russia
Burj Khalifa, Dubai, UAE
Akashi Kaiky Bridge, Akashi Strait, Japan
White Pass and Yukon Route Railroad, Canada
Tokyo Sky Tree, Tokyo
International Space Station
Panama Canal, Panama
Taipei 101, Taipei, Taiwan
Grand Canyon Skywalk, Arizona
Shanghai World Financial Center, Shanghai
Millau Viaduct, Millau, France
London Underground, London
Kansai Airport, Osaka, Japan
Hoover Dam, Arizona/Nevada
Great Pyramid of Giza, Egypt
Golden Gate Bridge, San Francisco
Eiffel Tower, Paris
Confederation Bridge, Prince Edward Island, Canada
CN Tower, Toronto, Canada/CNN/