Lake Kivu, Central Africa
Around 2 million people call Lake Kivu, a picturesque area on the border of the Democratic Republic of the Congo and Rwanda, home. But don’t be fooled by its beauty; it also contains a ticking time bomb that is just ready to explode. One of only three lakes in the world where limnic eruptions, a form of uncommon natural disaster in which carbon dioxide explodes from deep lake water, have been observed, is Lake Kivu. The end outcome is a gas cloud that can exterminate any life within miles. Oh, and experts aren’t even certain what would cause a possible limnic eruption at Lake Kivu. It goes without saying that you do so at your own peril!

Lake Kivu, Central Africa
Casa do Penedo, Portugal
The Stone House, sometimes called Casa do Penedo, is situated in northern Portugal. The mansion, which took two years to build—from 1972 to 1974—out of four enormous rocks, was first intended to serve as the owners’ getaway property. Today, however, it is only used as a tourist destination, notably a tiny museum showcasing artifacts from the house’s past. Despite being next to a wind farm, the residence doesn’t actually receive any electricity. What do you call rustic living?

Casa Do Penedo, Portugal