Wikipedia
Surajkund is an ancient reservoir of the 10th century, away to the south west from a more ancient dam of the 8th century called the Anagpur Dam; both are located 8 km (5 miles) from South Delhi in Faridabad, Haryana, India. Surajkund (literal meaning is 'Lake of the Sun') is an artificial Kund (‘Kund’ means “lake” or reservoir) built in the backdrop of the Aravalli hills with an amphitheatre shaped embankment constructed in semicircular form. It is said to have been built by the Gurjar king Suraj Pal of Tomar dynasty in the 10th century. Tomar was a sun worshipper and he had therefore built a Sun temple on its western bank.
Another 'kund' by the same name as ‘Suraj Kund’ existed in Sunam city, famous for Surajkund Mela, tahsil and sub-division of the Sangrur District in Punjab. This was sacked by Mahmood Ghaznvi or Taimur Lane. The temple is now in ruins.
Place is known for its annual fair "Surajkund International Craft Mela", 2015 edition of this fair was visited by 1.2 million visitors including 160,000 foreigners with more than 20 countries participating in it.