Sri Harmandir Sahib.
ਸ੍ਰੀ ਹਰਿਮੰਦਰ ਸਾਹਿਬ · The Golden TempleNothing you have read prepares you. You take off your shoes, you cover your head, you walk down the marble steps into the parikrama, and there it is in the middle of the Amrit Sarovar — a gold-leafed temple floating on water, the sound of kirtan drifting over from the causeway. It is the holiest site in Sikhism, and one of the more thoroughly humbling half-hours available on earth.
Go at dawn or after ten at night, when the marble is cool and the queue for the sanctum is shorter. Eat at the Langar afterwards — the world's largest free community kitchen serves a hundred thousand people a day, and yes, you should sit and eat. It is the point.