Nevado del Ruiz is a volcano located in Colombia, at an elevation of 5.321m (17,457ft) above the sea level. A sudden drop in the temperature, even in summer, can trigger winter-like conditions. The drive to approach the volcano is said to be the highest road in the country.
The volcano, also known as La Mesa de Herveo or Kumanday, is pretty active. In 1985, an eruption caused a devastating mud flow that killed almost 25,000 people in the town of Armero, marking one of the worst volcanic disasters in history.
The road to reach the Nevado del Ruiz starts asphalted in Manizales, in the Caldas province, and gets worse everytime. At Parador Turístico La Esperanza (4.117m) there’s a barrier, which can be closed anytime if there’s some volcano risk. Beyond this point 4x4 with high clearance is recommended. The last part of the climb is gravel. The road ends at 4.804m (15,761ft) above the sea level. At this point there are parkings, services, bars, etc, and starts the hike to the summit.