Bodrum's ancient theater may be small by Roman standards but it has been beautifully restored, and the views from the upper tiers, out towards the mountains, are superb. In its heyday during the 4th century, it would have held 13,000 spectators.
If you're here in summer, Bodrum uses the theater for a program of events and concerts. Check out if there's anything on while you're in town as seeing a performance within the theater is the best way of imagining how it would have been used in the grand era of Halicarnassus.