The reign of Queen Elizabeth II lasted a historic 70 years and 214 days. That's actually the second longest in world history – and this is how close the Queen came to breaking the all-time record.

During Princess Kate's heartfelt visit to Royal Marsden Hospital in London, Kate held onto an accessory with deep ties to the late monarch.

Documents newly declassified by MI5, Britain's internal intelligence agency, show the late Queen Elizabeth II was not informed for almost 10 years that a member of her staff had spied for the then-Soviet Union.

Kate Middleton returned to the Royal Marsden Hospital—where she received chemotherapy for her cancer—on January 14, and shared insight into her treatment while also revealing that she was in remission.