Because it lord shri krishnai's birth place
In Hinduism there are several places that are considered Holy land. Some of those places are Varanasi, Kerala, Sabarimala, and Uttar Pradesh.
Mathura is the name of a holy place of Hindu belief, where Lord Krishn was born in the prison of his mother's brother (Mama); Kans, who was the King of Mathura. Later Krishn killed him and made the Mathtra free from the terrorer of Kans.
In 1018, Mahmud Ghazni plundered the holy city of Mathura and also attacked Kanauj
Mathura (IAST mathurā) (Hindi: मथुरा) is a holy city in the Indian state of Uttar Pradesh. It is located approximately 50 km north of Agra, and 150 km south of Delhi; about twenty miles from holy Vrindavana.[1] http://en.wikipedia.org/wiki/Mathura
Mathura is important for Hindus because it is believed to be the birthplace of Lord Krishna, a major deity in Hinduism. The town is home to many temples dedicated to Krishna and is a significant pilgrimage site for devotees. Mathura's association with Krishna's childhood exploits and teachings make it a revered place for Hindus.
The country code and area code of Mathura- Mathura, India is 91, (0)565.
Surujpat Mathura died in 2007.
Lymantria mathura was created in 1866.
Mathura Museum was created in 1874.
Mathura train collision happened in 2009.
Mathura Mohan Das has written: 'Electricity'
To my information, no bird is considered holy in Islam.