Sporo Castle keep dates back to 1165, when it was built to protect an imperial road. The Sporo family owned the castle from 1312 to 1685. The castle was left to decay in 1720 and restored in 2009.
The structure consists of a pentagonal keep and walls with four towers that enclosed residential buildings and a chapel.
Considered to be one of the most imposing Roman ruins, Diocletian’s palace is certainly the main attraction of the city of Split. The ruins of palace, built between the late 3rd and the early 4th centuries A.D., can be found throughout the city. Today the remains of the palace are part of the historic core of Split, which in 1979 was listed by UNESCO as a World Heritage Site.
While it is referred to as a 'palace' because of its intended use as the retirement residence of Diocletian, the term can be misleading as the structure is massive and more resembles a large fortress: about half of it was for Diocletian's personal use, and the rest housed the military garrison.
The palace has a form of an irregular rectangle with numerous towers on the western, northern, and eastern facades.