A terra cotta warrior is on display at the Houston Museum of Natural Science in Houston, the United States, on Oct. 18, 2009. The exhibition "Terra Cotta Warriors: Guardians of China's First Emperor" is concluded at the museum on Sunday, receiving over 200,000 visitors during its 5-month-long exhibition period. (Xinhua/Chen Ruwei)

Visitors admire the displayed terra cotta warrior at the Houston Museum of Natural Science in Houston, the United States, on Oct. 18, 2009. (Xinhua/Chen Ruwei)

Visitors admire the displayed terra cotta warriors at the Houston Museum of Natural Science in Houston, the United States, on Oct. 18, 2009. (Xinhua/Chen Ruwei)