The $44-billion Shanghai World Expo 2010 has been dubbed the mother of all world's fairs.

The expo officially opened to people on May 1 and an estimated 433,000 people visited the site on its first weekend. It is spread over 5.3 sq km and almost all the nations in the world have set up their respective pavilions here.

Image: Fireworks light up the night sky at the Shanghai World Expo 2010 at the China pavilion.

Photograph: Reuters

The India pavilion at the Shanghai World Expo 2010.

Photograph: Reuters

The India pavilion at the Shanghai World Expo 2010.

Photograph: Reuters

Fireworks light up the night sky at the Shanghai World Expo 2010.

Photograph: Reuters

Fireworks light up the night sky at the Shanghai World Expo 2010.

Photograph: Reuters

An aerial view of the the Shanghai World Expo 2010.

Photograph: Reuters

Fireworks light up the night sky at the Shanghai World Expo 2010.

Photograph: Reuters

Residents watch fireworks beside flag masts at the Shanghai World Expo site.

Photograph: Reuters

The Denmark pavilion at the Shanghai World Expo 2010.

Photograph: Reuters

The United Arab Emirates pavilion at the Shanghai World Expo site.

Photograph: Reuters

A night view shows the France pavilion at the Shanghai World Expo site.

Photograph: Reuters

The Romanian pavilion at the Shanghai World Expo site.

Photograph: Reuters

The Pakistan pavilion at the Shanghai World Expo site.

Photograph: Reuters

The Turkey pavilion at the Shanghai World Expo site.

Photograph: Reuters

Fireworks light up the night sky at the Shanghai World Expo 2010.

Photograph: Reuters

The Israel pavilion at the Shanghai World Expo site.

Photograph: Reuters

A night view shows the Mexico pavilion at the Shanghai World Expo site.

Photograph: Reuters

Visitors queue up to visit the UK pavilion at the Shanghai World Expo 2010.

Photograph: Reuters