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Kesariya is a town in Bihar, India in the district of East Champaran, near Rampur Khajuria (NH28). It is the site of a stupa built by the King Ashoka. It is one of, if not the largest stupa in India. The Buddha once stayed in Kesariya (then called "Kesaputta"). On that occasion, he preached the Kesaputtiya Suttas (a group of suttas preached to the Kalamas of Kesaputta — A.i.188), which include the Kalama Sutta. The inhabitants of Kesariya were the Kosalans and the Kalamas.
Kesaria was claimed the tallest and the largest Buddhist Stupa in the world. But Mirisawetiya, Abhayagiriya, and Ruwanweliseya in Anuradhapura, Sri Lanka are the taller than Kesariya with over 300 feet each. Jetawanaramaya, also situated in Anuradhapura, Sri Lanka is the tallest largest stupa in the world standing at approximately 400 feet (122m). The stupa was discovered in 1998 during an excavation by the Archaeological Survey of India (ASI). The stupa dates to between 200 AD and 750 AD and may have been associated with the 4th century ruler, Raja Chakravarti.The local people call this Stupa as Devala, "means the house of god". Before the excavation of this, they believed that inside it there is a temple of 'Lord shiva' which is built by king Bhema . 
Viraat Ramayan Mandir
Viraat Ramayan Mandir is an upcoming Hindu temple complex that began construction in Kesaria, Bihar, India, in 2012 with an estimated budget of INR500 crore. When completed, it will be the largest religious monument in the world, even larger than the Angkor Wat, Cambodia. The Virat Ramayan Mandir will be almost double the height of the world famous 12th century Angkor Wat temple complex in Cambodia, which is 215 feet high.The temple will have a hall with a seating capacity of 20,000 people.
Transportation and hotels
Bihar State Tourism Development Corporation  provides travel and accommodation from the state capital, Patna, for visits to the Bodh circuit (Bodhgaya, Rajgir, Nalanda, Vaishali, Kesaria, Lumbini, Kushinagar, Sarnath), Jain Circuit (Rajgir, Pawapuri), and Sikh Circuit in Bihar. The corporation owns hotels and circuit homes at these tourist destinations.
World's longest stupa (Around 104 feet in height).
The Kesariya Stupa - maps.google
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