Beijing had its day with the Olympic Games – now it's Shanghai's turn.

The gigantic World Expo is an innovation extravaganza taking place in China's business capital, with countries and corporations from all over the world exhibiting their most cutting-edge products.

Set to run for 6 months, the Expo's budget eclipses that even of the Olympics.

Its official cost is $28 billion but some estimate the total investment may be as much as $95 billion, taking into account huge infrastructure projects including new highways and subway lines.

Beijing had its day with the Olympic Games – now it's Shanghai's turn.

The gigantic World Expo is an innovation extravaganza taking place in China's business capital, with countries and corporations from all over the world exhibiting their most cutting-edge products.

Set to run for 6 months, the Expo's budget eclipses that even of the Olympics.

Its official cost is $28 billion but some estimate the total investment may be as much as $95 billion, taking into account huge infrastructure projects including new highways and subway lines.