The Castle of Bodrum retains its original design and character of the Knights’ period and reflects Gothic architecture. It also contains the Bodrum Museum of Underwater Archaeology, a museum established by the Turkish government in 1962 to host the underwater discoveries of ancient shipwrecks in the Aegean Sea.

In 2016, the castle was included in the Tentative list of World Heritage Sites in Turkey. The castle has been under renovation since 2017, and only some parts of it are accessible to visitors.

Built in the fourth century BC, the ruins of the Mausoleum at Halicarnassus are also among the main sights in Bodrum. The Mausoleum at Halicarnassus was a tomb designed by Greek architects and built for Mausolus, a satrap of the Persian Empire, and his sister-wife Artemisia II of Caria.

The structure was considered one of the Seven Wonders of the Ancient World,. By the 12th century CE, the structure had largely been destroyed. Today, the ruins of the tomb continue to attract both domestic and international tourists. It is planned to turn the ruins into an open-air museum.