Gangotri & Yamunotri yatra is referred as a Do dham yatra to two river goddesses - Ganga and Yamuna respectively. Ganga, which hails from heaven to the earth in the form of Bhagirathi, descend on earth to relive the souls of King Bhagirath ancestors, while Yamuna the sister of God of Death Yama, saves people from dying a painful death who take a holy dip in her water. Such a strong association in Hindu mythology places goddess Ganga and Yamuna in a high rank of divinity.
Gangotri is a place where the great holy river Ganges originate. Gangotri has a special significance to Hinduism, according to mythology it's the place where river Ganges came to earth due to severe penance by King Bhagirath. This Gangotri Dham have a temple which is dedicated to the goddess Ganga. This temple is about 20 feet high structure made of white granite. Every year pilgrim from all around INDIA and rest of the world visit this shrine during the months of May to June and September to October.
Yamunotri is the source of the Yamuna River and the temple is devoted to goddess river Yamuna. This temple is on the left bank of Yamuna. The goddess Yamuna is said to be twin sister of god of death Yama; in Vedas, Yamuna is called Yami (lady of life). A bath in Yamuna River is said to cleanse all sins of devotee's and protect them from untimely or painful death. Due to such a strong associations in Hindu mythology, every year pilgrim from all around INDIA and rest of the world visit this shrine to take the blessings of goddess Yamuna.