Estonian Foreign Minister Urmas Paet addresses the ceremony.

Estonia celebrates its National Pavilion Day on October 18 with a concert.

The Baltic country's exhibition titled "Saving Cities" features large, colorful piggybanks where visitors can deposit suggestions to improve urban life.

They can also e-mail suggestions. At the end of the World Expo, the suggestions will be analyzed and shared.

Choral singing is an important part of Estonia's culture and the pavilion features karaoke singing all day.

Exhibitions cover history, culture, economy, environmental protection, tourism and urban living.