1. Pamukkale, also known as the "Cotton Castle", is famous for its surreal, brilliant-white travertine terraces filled with thermal water, formed over millennia by calcium-rich springs.

2. Its rich thermal spa history dates back to 2nd century BC when it was the ancient Greco-Roman city of Hierapolis.

3. Local legend believes that Pamukkale's thermal waters have healing properties, potentially curing illnesses like asthma and rheumatism.

4. The ancient pool, Cleopatra’s Pool, is believed to have been gifted to Cleopatra by Marc Antony.

5. It hosts the International Pamukkale Music and Cultural Festival annually, showcasing a variety of Turkish arts and music.

1. Visit Hierapolis and Pamukkale's Travertines: The travertine terraces of Pamukkale and the ancient city of Hierapolis are UNESCO World Heritage Sites and must-visit attractions. Visit early morning or late afternoon for fewer crowds, and remember to bring non-slip shoes as the site can be slippery.

2. Take Advantage of Public Transport: Denizli has an efficient public transportation system. Save money by using minibuses (Dolmuş) and trams, which are cheaper than taxis and have routes that cover most of the city, including Pamukkale.

3. Explore Local Cuisine: For dining, don’t miss out on trying regional specialties such as 'Denizli Kebab' and 'Tavas Kebab’. Many eateries offer delicious meals at reasonable prices. Visit the bustling market area around the Ataturk Caddesi and Doktorlar Caddesi for an array of dining options.

4. Visit During Off-Peak Season: The best time to visit Pamukkale is during the shoulder seasons of spring (April to June) and fall (September to November). The weather is more comfortable for outdoor exploration and the sites are less crowded.

5. Plan Your Itinerary Wisely: Apart from Pamukkale and Hierapolis, consider including other attractions in your itinerary such as the Laodicea ruins or the Kaklik caves. Also, allocate time to enjoy the thermal pools at Cleopatra’s Pool or Karahayit. This way you can maximise your sightseeing experience.