From aps.org (American Physical Society)

This has a great overview of major General Relativity validations etc.

excerpt:

November 2015 marks the centennial of Einstein’s theory of general relativity. Here is a collection of Physics articles about APS papers that grew out of Einstein’s ideas.

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The Birth of Wormholes

In 1935, Einstein and Nathan Rosen, both at the Institute for Advanced Study at Princeton University, introduced what science fiction readers would recognize as a wormhole—a tunnel-like short-cut between two regions of spacetime ...

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One Hundred Years