Drill straight through the center of the Earth from Honolulu, USA and you'd surface on the exact opposite side of the planet — its antipode.
Honolulu's antipode sits at 21.31°S, 22.14°E, in the southern hemisphere, east of Greenwich. That places it in or near the Indian Ocean.
It lies roughly 20,015 km from Honolulu — 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 Honolulu.
Honolulu's antipode is a rare one: it actually lands on solid ground, about 6 km from El Fari Bush Camp, a campsite in Botswana. 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.