The resort opened on May 3, 1999, with flutter of white doves, sounding trumpets and singing gondoliers, with actress Sophia Loren joining The Venetian Chairman and Owner, Sheldon G. Adelson, in dedicating the first motorized gondola. Built at a cost of $1.5 billion, it was one of the most expensive resorts of its kind when it opened.

Answer this question based on the passage: when was the venetian hotel in las vegas built? Okie... think carefully first, then make a decision:
The relevant information is: The resort opened on May 3, 1999, with flutter of white doves, sounding trumpets and singing gondoliers, with actress Sophia Loren joining The Venetian Chairman and Owner, Sheldon G. Adelson, in dedicating the first motorized gondola. So, the answer is May 3 , 1999.