Case file · High strangeness
Koreshan Unity and the hollow earth
In 1894 Cyrus Teed, who called himself Koresh, moved his followers to Estero, Florida, to build a 'New Jerusalem' based on his teaching that we live on the inside of a hollow sphere.
1894 CE · 26.43, -81.81 · status: claim
The account
In 1897 his 'Geodetic Survey' used a device called the rectilineator on Naples beach to 'prove' the earth's surface curves upward. Teed died in 1908; his followers expected him to rise again.
The sceptical view
The concave-earth idea is contradicted by every measurement of the planet; the settlement is now Koreshan State Park.