Denizli, city, southwestern Turkey. It lies near a tributary of the Menderes River.
Set among the gardens at the foot of Mount Gökbel (7,572 feet [2,308 metres]), Denizli inherited the economic position of ancient Laodicea ad Lycum, 4 miles (6 km) away, when that town was deserted during wars between the Byzantines and the Seljuq Turks in the 12th century. By the 14th century, as Lâdik (Lādīq), Denizli had emerged as an important Turkish town noted for its woven and embroidered products and its luxuriant gardens. It was ravaged by earthquakes in the 18th and 19th centuries.
In the surrounding agricultural area the cultivation of cotton, cereals, figs, and tobacco, along with livestock raising, are the principal activities. North of Denizli is Pamukkale (ancient Hierapolis), a resort around which limestone deposits from the hot springs have formed beautiful cascades and basins. 

Hierapolis And The Cotton Castle At Pamukkale,
Hierapolis is an ancient Greek city dated around 400BC, renowned as a medical centre of yore. It was built near Pamukkale, natural thermal springs that were proclaimed to have health benefits.
As per legend, the more prominent health city was Pergamum, which had a huge medical facility that declared – No one can die here. In case they found any patient who had bleak chances of survival, they would send them off to Hierapolis so that death would not enter Peragum’s health facilities.The thermal springs themselves are natural wonders. The water here is rich in minerals, and hence has calcified stalagmites where the springs flow into the valley, giving an impression that these are castles made of cotton.
Hieropolis Museum,
This small but excellent museum dedicated to Hierapolis is inside the ancient city's former Roman bath house. A visit here will help bring the city to life. The exhibits showcase some of the beautiful artistry and cultural heritage of this once important city, displaying a variety of finds from the site, including gorgeous and intricate stone reliefs, sarcophagi, and statuary. The museum also has a decent collection of statuary from the nearby archaeological site of Aphrodisias.
Hierapolis Theater,
On a slope above the rest of the Hierapolis ruins is the mighty theater, with its facade over 100 meters long and two tiers of seating, each with 26 rows. Built during the reigns of the Roman Emperors Hadrian and Septimius Severus, the theater is incredibly well-preserved. It has retained much of its original detail, with the imperial boxes (where VIP guests would have watched the entertainment) and some decorative panels along the stage still surviving. There are fine views from the top seating tiers.