The Burj Khalifa, Dubai, UAE: Completed in 2010 at a cost of approximately $1.5 billion, this iconic skyscraper stands at 828 meters (2,717 feet) tall and is the tallest building in the world.
The Channel Tunnel (Eurotunnel), UK/France: Completed in 1994 at a cost of around £9 billion (approximately $11.6 billion), this undersea rail tunnel connects England and France beneath the English Channel.
The Shard, London, UK: Completed in 2012 at a cost of £435 million (approximately $565 million), The Shard is Western Europe's tallest building at 310 meters (1,017 feet), featuring offices, restaurants, and a hotel.
The International Space Station (ISS): Assembled in orbit starting in 1998, the ISS is a multinational collaborative project involving billions of dollars from NASA, Roscosmos, ESA, JAXA, and CSA for construction and maintenance.
King Abdullah Economic City, Saudi Arabia: This mega-project, with an estimated total cost exceeding $100 billion, includes a new city, industrial zone, port, and residential developments along the Red Sea coast.
Tokyo Skytree, Tokyo, Japan: Completed in 2012 at a cost of approximately ¥65 billion (around $610 million), Tokyo Skytree is the tallest tower in the world at 634 meters (2,080 feet), serving as a broadcasting and observation tower.
Palace of the Parliament, Bucharest, Romania: Constructed during the Communist era, this massive government building is one of the largest administrative buildings in the world, with an estimated cost of around $3 billion.
Panama Canal Expansion: Completed in 2016 at a cost of over $5 billion, this expansion project involved the construction of new locks to accommodate larger ships and increase the canal's capacity.