Mathura
The Krishna Janmabhoomi complex in Mathura marks the exact site of Lord Krishna's birth — a prison cell in the Kansa palace where Devaki and Vasudeva were held captive. The complex includes the main Keshav Dev temple, the underground cell (prison chamber) that is the actual birthplace, and the adjoining mosque — a setting of extraordinary and complicated historical layering. For devotees of Krishna, this is the holiest ground on earth.
Security is strict — no cameras, phones, or bags allowed inside; leave them in lockers at the entrance. Janmashtami night draws hundreds of thousands of devotees — an extraordinary experience but requires enormous patience and planning.