A 2025 satellite photo shows the Caldas Novas dome, a 12-mile-long monolith that towers above the Brazilian state of Goiás. The structure acts as a giant sponge, soaking up water that helps fuel nearby hot springs.
Towering 'sponge' dome in Brazil is the secret source of nearby hot springs
Live Science - 29 Sep 2026 10:56
A 2025 satellite photo shows the Caldas Novas dome, a 12-mile-long monolith that towers above the Brazilian state of Goiás. The structure acts as a giant sponge, soaking up water that helps fuel nearby hot springs.
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