Virunga National Park is inviting tourists on an overnight trek to a spectacular eruption of Mount Nyamulagira in eastern Congo.
The volcano began erupting on November 6 and has several lava fountains spewing up to 650ft into the air.
A statement from the park, a World Heritage site, said rivers of incandescent lava are flowing slowly north into an uninhabited part of the park and pose no danger to its critically endangered mountain gorillas.
The park has set up a camp in a safe area close to Nyamulagira, where visitors can spend the night.
The eruption could last days or months.
An eruption of nearby Mount Nyiragongo in 2002 destroyed most of Goma city and forced 350,000 residents to flee.