See links to modern structures modeled after Halicarnassus here.
There are varying ideas of what Mausolus’ tomb actually looked like. A very long article on varying construction ideas from historians can be read here.
A model that is housed at the Bodrum Museum of Underwater Archeaology can be viewed here.
The third Wonder of the World—the marble tomb of King Mausolus at Halicarnassus, just south of Ephesus. The tomb was 140 feet high and topped with a huge marble chariot drawn by marble horses, and driven by the marble figures of King Mausolus and his Queen. This wonderful tomb stood for 1000 years. A drawing of Mausolus’ Tomb from Antonio Tempesta’s The Seven Wonders of the World, published in 1610, possibly showing it still under construction. (public domain)