When a mysterious crescent appeared over Moscow in 1967, alien enthusiasts were unaware they were actually tracking a 3-megaton weapon designed to bypass American radar.

Documents might help scientists shed light on unexplained phenomena and government secrets, experts said.

Airbnb has an “OMG” category filled with the strangest homes on the planet — and this trip put them to the test. From sleeping inside a rotating crane in Amsterdam to recreating an alien landing in a ...