At 4,320 meters, El Tatio is the world's highest geyser field and the third largest. Over 80 active geysers shoot tall steam columns into the freezing morning air - the spectacle at sunrise is otherworldly as golden light illuminates the vapor plumes. Tours depart San Pedro at 4am to arrive at dawn. After exploring fumaroles and bubbling pools, relax in a natural hot spring pool with surreal views. Temperatures can drop to -16°C, so bring serious layers. Allow 2-3 days to acclimatize to altitude before visiting.