It was the huge white marble Wonder located at Halicarnassus
The 
Mausoleum was built on a hill that kept watch over Maussollos'... [DOC] [TLE] Mausoleum at Halicarnassus Facts - SoftSchools [PAR] The Mausoleum at Halicarnassus was built by Artemisia after her husband 
Mausolus died.