Question 2 of 21

The Burj Dubai became the tallest skyscraper in the world when it was completed in 2009. How much did this mega-structure cost to build?

... The Burj Dubai, which was renamed Burj Khalifa in 2010, extends more than 2,717 feet (828 meters) into the sky and cost a reported $1.5 billion to build. Tom Cruise famously scales the structure in "Mission: Impossible - Ghost Protocol" (2011).

Question 3 of 21

Once known as the Freedom Tower, how much will the structure at One World Trade cost to complete?

... Thanks to extreme security measures, the massive new structure at Ground Zero is expected to cost $3.8 billion, making it one of the most expensive buildings ever constructed. When it's done, it will become the tallest building in North America.

Question 4 of 21

The Yongsan Landmark Tower in this Asian city is expected to cost nearly $3.5 billion to construct.

... The construction cost for Seoul's Yongsan Landmark Tower is estimated at nearly $3.5 billion. That's more than double the cost of the Burj Dubai, which has 162 stories compared to the 100 stories of the Seoul structure.

Question 5 of 21

How much did the Ambani family pay to construct Antilla, the world's most expensive house?

... The Ambani family home in Mumbai features 27 stories and cost more than $2 billion to construct.

Question 6 of 21

What sports arena was completed at a cost of $1.64 billion in 2007?

... The new Wembley Stadium cost $1.64 billion, making it the world's most expensive sports arena. It's also one of the largest, with seating for 90,000 fans.

Question 7 of 21

Buildings here on Earth may be expensive, but they're nothing compared to structures built in space! How much did it cost to construct the International Space Station?

... The International Space Station cost an estimated $100 billion, despite the fact that it's about as spacious as the average three-room house here on Earth.

Question 8 of 21

It cost 32 million rupees to construct the Taj Mahal during the 17th century. About how much does that equate to in today's dollars?

... It took 22,000 workers more than 20 years to construct the magnificent Taj Mahal in Agra, India. Its price tag of 32 million rupees equates to about $1 trillion in today's dollars.

Question 9 of 21

Where can you find the world's most expensive swimming pool, which opened in 2006 and cost more than $1 billion?

... The San Alfonso del Mar resort in Chile is home to the world's most expensive pool. It holds 66 million gallons of water, and achieved the Guinness World Record for the world's largest pool.

Question 10 of 21

In 2013, drivers will be able to travel between these two cities on a $7.2 billion bridge, which was constructed in China and shipped to the United States.

... The new San Francisco-Oakland Bay Bridge should be completed in 2013. It will replace the existing bridge, which was damaged by a 1989 earthquake.

Question 11 of 21

How much did the new Yankee Stadium, which was completed in 2009, cost to construct?

... The new Yankee Stadium cost $1.5 billion, making it the most expensive sports arena in the United States. It was constructed to replace the existing stadium, which dated back to 1923.

Question 12 of 21

No one knows exactly how much the Great Pyramid of Giza cost when it was constructed 4,500 years ago. How much do experts estimate it would cost to build the structure today?

... Thousands of workers used more than 2.3 million stones to construct the Great Pyramid more than 4,000 years ago. Today, experts estimate it would cost $5 billion to construct and would take around five years to finish.

Question 13 of 21

How much did the Chinese spend to construct the massive Bank of China building in Hong Kong?

... With a price tag of $1.66 billion, the 72-story Bank of China tower is one of the world's most expensive skyscrapers.

Question 14 of 21

How long is the Great Wall of China, according to a 2012 survey?

... The Chinese spent around 2,000 years constructing the Great Wall, which was built to keep out northern invaders. There's no way to tell how much the Great Wall cost, but a 2012 survey revealed that it stretches more than 13,170 miles (21,195 kilometers). Parts of the wall are made by human hands, while others are made up of trenches and natural barriers, like mountains.

Question 15 of 21

The 101-story skyscraper in this Asian city was the world's tallest building until the Burj Dubai took the title.

... The Taipei 101 cost $2.06 billion. It was the tallest building in the world when it was completed in 2004, until the taller Burj Dubai was completed just five years later.

Question 16 of 21

About how much do the world's largest cruise ships, such as the 6,300-passenger "Oasis of the Seas", cost to build?

... With a $1.5 billion price tag, the "Oasis of the Seas" cost about as much to construct as many of the world's tallest skyscrapers.

Question 17 of 21

Starting around A.D. 73, as many as 30,000 slaves used 240,000 cartloads of travertine just to construct the exterior of this ancient structure.

... Though no one knows how much it cost to build, the Roman Colosseum required a massive workforce and a staggering amount of stone.

Question 18 of 21

After spending a whopping $2.7 billion to build the Wynn Resort in Las Vegas, Steve Wynn spent just $2.3 billion to construct this hotel three years later.

... The Wynn and the slightly smaller Encore are among the most expensive resorts in the world. While the Encore cost $2.3 billion and the Wynn $2.7 billion, the MGM Grand cost just $1 billion, despite the fact that it has twice as many rooms as the Wynn.

Question 19 of 21

In 2005, the New South China Mall became the world's largest shopping mall. How much did it cost to build?

... Developers spent $400 million to construct the New South China Mall, which opened in 2005. As of 2012, the majority of the mall's 1,500 storefronts remain empty.

Question 20 of 21

Where will you find the world's most expensive airport, which opened in 2010 and cost $32 billion to build?

... The Al Maktoum International Airport in Dubai cost a whopping $32 billion to construct. It is part of a planned "aerotropolis," which should be completed in 2027 at a cost of $82 billion.

Question 21 of 21

After spending around $2.5 million to construct the U.S. Capitol Building, how much did the U.S. government spend to build its iconic dome?

... From 1793 to 1827, the government spent around $2.5 million building the U.S. Capitol. From 1855 to 1866, it took another $1 million and 9,000,000 pounds of ironwork, to construct the Capitol dome.

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