This is Destroyer Shop Velos. Since stricken in 1991, she was repurposed as a Museum ship.
Velos was earlier known as USS Charrette and is a Fletcher-class Destroyer. She was transfered to the Kingdom of Greece in 1959.
She was used by USA in Pearl Harbor among other wars. In 1994 the Hellenic Navy General Staff declared her a Museum of the Struggle against the Dictatorship, and is open to the public. Velos will be in Thessaloniki, near Thessaloniki Concert Hall for 3 months. The entrance fee is €1 (and it is waived for various reasons, such as people with disabilities, underage people etc)