An antipode is the point on Earth diametrically opposite another — where you would surface if you dug straight through the centre of the planet. Below are the antipodes of 391 major cities, with exact coordinates and what is actually located there.
Most antipodes are underwater. Earth's land and water are distributed such that only about 15% of land has land directly opposite it, and that holds here: just 66 of these 391 cities have an antipode on dry land.
The rarer and more interesting case — 66 cities.
Antipodal turns this into a game: you get a hidden location on a 3D globe and five guesses to find its antipode, with warmer and colder hints along the way. How to play.