Sigiriya, in fact, should have been classed as one of the Wonders of the Ancient World, long ago, and there is now a proposal to name it as the Eighth Wonder of the world. Perhaps, it is better late than never!

Sri Lanka's ancient architectural tradition is well portrayed at Sigiriya, the best preserved city centre in Asia from the first millennium, with its combination of buildings and gardens with their trees, pathways, water gardens, the fusion of symmetrical and asymmetrical elements, use of varying levels and of axial and radial planning. Sophisticated city planning was at the heart of Sigiriya, this royal citadel of ancient fame from the days of Sri Lanka's memorable past.
Sigiriya dates back from over 7,000 years ago, through Pre-Historic to Proto-Historic to Early Historic times, then as a rock-shelter mountain monastery from about the 3rd century BC, with caves prepared and donated by devotees to the sangha.
The garden city and the palace was built by Kasyapa 477 - 495 AD. Then after Kasyapa's death it was a monastery complex upto about the 14th century.
The Mahavamsa, the ancient historical record of Sri Lanka, describes King Kasyapa as a parricide, who murdered his father King Dhatusena by walling him up alive and then usurping the throne which rightfully belonged to his brother Mogallana. To escape from the armies of Mogallana, Kasyapa is said to have built his palace on the summit of Sigiriya, but Mogallana finally managed to get to Kasyapa and he committed suicide.

However, there is also another version of the Kasyapa story, related by one of the most eminent historians of Sri Lanka, Prof. Senerat Paranavitana. He claims to have deciphered the story of Sigiry, written by a monk named Ananda in the 15th cent. AD. this work had been inscribed on stone slabs, over which later inscriptions had been written. Till to date no other epigraphist has made a serious attempt to read the interlinear inscriptions.
The two conflicting versions have been the basis for the historical novel Kat Bitha’ by daya dissanayake, published in 1998.

Sigiriya is also the location for Arthur C Clerks ‘Fountains of Paradise’
Sigiriya (Lion's rock) is an ancient rock fortress and ruins of a castle situated in central Matale District of Sri Lanka. It is a popular tourist destination and also popular for the ancient paintings (frescos) very similar to the paintings in Ajanta Caves of India. It was built during the reign of King Kasyapa (477 – 495 AD) and one of the seven World Heritage Sites of Sri Lanka.
Sigiriya may have been inhabited through prehistoric times. It was used as a rock-shelter mountain monastery from about the 5th century BC, with caves prepared and donated by devotees to the Buddhist Sangha. The garden and palace were built by King Kasyapa. Following King Kasyapa's death, it was again a monastery complex up to about the 14th century, after which it was abandoned. The ruins were discovered in 1907 by British explorer John Still. The Sigiri inscriptions were deciphered by the archaeologist Senarath Paranavithana who published a renowned two volume work, published by Oxford, known as "Sigiri Graffiti". He also wrote the popular book "Story of Sigiriya".The Mahavamsa, the ancient historical record of Sri Lanka, describes King Kasyapa as the son of King Dhatusena. Kasyapa murdered his father by walling him alive and then usurping the throne which rightfully belonged to his brother Mogallana, Dhatusena's son by the true queen. Mogallana fled to India to escape being assassinated by Kasyapa but vowed revenge. In India he raised an army with the intention of returning and retaking the throne of Sri Lanka which was rightfully his. Knowing the inevitable return of Mogallana, Kasyapa is said to have built his palace on the summit of Sigiriya as a fortress and pleasure palace. Mogallana finally arrived and declared war. During the battle Kasyapa's armies abandoned him and he committed suicide by falling on his sword. Chronicles and lore say that the battle-elephant on which Kasyapa was mounted changed the course just to get to a better fighting position/place but the army misinterpreted it as the King fleeing. Thereafter the army abandoned the king altogether. Moggallana returned the capital to Anuradapura and turned Sigiriya into a monastery complex.

Alternative stories have the primary builder of Sigiriya as King Dhatusena, with Kasyapa finishing the work in honour of his father. Still other stories have Kasyapa as a playboy king, with Sigiriya a pleasure palace. Even Kasyapa's eventual fate is mutable. In some versions he is assassinated by poison administered by a concubine. In others he cuts his own throat when isolated in his final battle.