Drill straight through the center of the Earth from Shanghai, China and you'd surface on the exact opposite side of the planet — its antipode.
Shanghai's antipode sits at 31.23°S, 58.53°W, in the southern hemisphere, west of Greenwich. That places it in or near the Atlantic Ocean.
It lies roughly 20,015 km from Shanghai — about as far apart as two points on Earth can possibly be. And the relationship is symmetric: the antipode of that spot is, of course, right back here in Shanghai.
Shanghai's antipode is a rare one: it actually lands on solid ground, about 8 km from Colonia La Armonia, an isolated settlement in Argentina. Most cities don't get that lucky — antipodal land pairs are uncommon since water covers about 71% of the globe.
Antigea's live map shows the satellite view, the closest Street View, and the local time on the other side of the world.