Thiruvananthapuram Sree Padmanabhaswamy Temple is one of the beautiful temples I have visited as a young girl of 11 years. I was not much aware of the significance of the temple or its history at that time. But later, I did some reading to know about this sacred place of Shree Padmanabhaswamy (Lord Mahavishnu), from whose name the capital city of Kerala, ‘Thiruvananthapuram’, got its name.
Padmanabhaswamy Temple is built as a fusion of Chera style and the Dravidian style of architecture. The main deity Shree Padmanabhaswamy is enshrined in the “Anantha Shayana” posture on the serpant “Aadi Sesha”. The idol of the Lord is so huge that we can have the darshan of the deity 
through three doors only. HE is the tutelary deity of the Travancore royal family. The rulers of Travancore are known by the name ‘Padmanabha Dasa’ meaning ‘Servant of Padmanabha’. The name of every Travancore king is preceded by the title ‘Sree Padmanabha Dasa’.
When you enter the temple through the front Gopuram, which looks like the temple gopurams in Tamilnadu (unlike the temple architecture in Kerala), we can see long corridors surrounding the temple with pillars.
This templeis one of the 108 principal ‘Divya Desams’ (Holy Abodes) in Vaishnavism. The temple is glorified in the Divya Prabandha. The origins of this temple are literally untraceable as there are no historical documents available to date its antiquity.
Sri Padmanabhaswamy Temple is the richest temple in the world, with its Temple Treasury vaults lies a 
treasure of an estimated one hundred Trillion dollars. There is another vault known as Vault B, which is more intriguing. It is the secret door behind the Chamber B that is forbidden to open by human efforts.
There is a strict dress code visitors need to adhere . Men should wear a dhoti or mundu while women should wear a saree or a skirt or blouse. To anyone who visits Thiruvananthapuram, Sree Padmanabhaswamy Temple is a must visit place.