Democratic Republic of the Congo
How it'll go: Volcanic explosions, limnic eruptions
Goma sits about 12mi south of the active volcano Nyiragongo, which has a 50% chance of striking the city. The African metropolis of about 500,000 people toes a line with disaster each time smoke rises above the volcano. In 2002, Goma crossed that line, when a fifth of the city was covered in lava following an eruption.
But perhaps more interesting is Goma's vulnerability to limnic eruptions; a limnic eruption is basically when a lake overturns its supply of carbon dioxide and suffocates all its living surroundings -- plants, animals, and people. Effectively, a lake becomes one giant gas chamber. Scientists have closely watched Goma’s Lake Kivu, which has just enough toxic ingredients to produce this rare type of disaster triggered by lava flow.
What you’ll miss: Conflict in the northern and eastern DRC is no joke, which is why foreign governments often advise against traveling there. Fighting in the region has left little security for travelers and residents. But as a formerly pleasant lakeside town, Goma is exactly one of the DRC's best assets, despite the ominous threat of liquid rock looming over everything. Nyiragongo is famed for its lava lake, which visitors can climb through hiking and tour companies. The city also boasts some of the cheapest mountain gorilla tracking in Africa in Virunga National Park.