One morning, in a hospital in the Czech Republic, a 69-year-old man died of heart disease. An hour later, as nurses were preparing to move his body down to the lab for autopsy, they noticed his skin was unusually warm. After calling the doctor back to make sure the man was really dead (he was), they took his temperature. At 1.5 hours after death, the body was 104 degrees Fahrenheit—about five degrees hotter than it was before he died, even though the hospital room was kept at about 68 degrees.

The temperature during the day hovers around 107 degrees Fahrenheit, even in early spring. It's dry, and sulfur and chlorine cloud the air, burning the lungs of people unfortunate enough to be close to the boiling hot springs, roiling with salt, and heated by magma deep in the Earth. Welcome to the Danakil Depression in Ethiopia. It's 328 feet below sea level, volcanically active, a home to salt traders and sought out by adventurers.

Despite what Kurt Vonnegut says, Saturn's largest moon Titan wouldn't be a very fun place to visit. The natural satellite boasts temperatures of -290 degrees Fahrenheit, as well as vast seas filled not with Earth's life-sustaining water, but with liquid methane. It's also possible that numerous active volcanoes on Titan burp out methane into the atmosphere, creating clouds that precipitate the chemical compound as rain or snow.