Planet X, or Planet 9 as we're gonna refer to, is a possible Neptune-sized object in a elliptical orbit around the sun so far away its orbit could take 10,000 to 20,000 Earth years to complete, recent...

Stonehenge is an enormous group of trilithons made entirely out of stone, and is located in Salisbury, UK. Stonehenge is considered a wonder because of how old it is, as it was erected before the Great Pyramids of Giza, the Hanging Gardens of Babylon, and even the creation of the wheel!