The aptly named Fuego (Fire) is one of Central America's most active volcanoes, providing onlookers with pretty consistent lava-infused excitement since, oh, sometime in the mid-16th century. And no, not all of these eruptions have been enjoyable spectacles. As recently as September of 2012, this 3,763 m stratovolcano forced the evacuation of nearly 10,000 Guatemalans, emitting an ash cloud that extended some 1,500 m above the crater.
Still interested in tackling it? Well, first things first; you won't be ascending the summit for obvious reasons. It's possible, however, to climb to the "knife's edge" (a ridge connecting Fuego with nearby Acatenango to the north) and set up camp on the lava-free side of the massif. From here, you can enjoy a night of earth-trembling eruptions as you try and figure out a way to explain what you're experiencing to the folks back home. It's a strenuous climb that can easily be paired with a trek up Acatenango, so be sure to give yourself a couple of days to fully appreciate this incredible slice of Guatemala. It's hands down one of the continent's most impressive geological phenomena.