Dismals Canyon, National Natural Landmark in Northwest Alabama, United States.

Dismals Canyon is a sandstone gorge near Phil Campbell in Franklin County, Alabama, operated as part of an 85-acre (34 ha) nature preserve. Two waterfalls, Secret Falls and Rainbow Falls, drop over dark rock shelves, and six natural bridges span the canyon. The photograph shows water falling in separate curtains over blocky dark grey rock, with moss on the stepped left face and a shallow pool below.

Chickasaw people were held captive in the canyon for two weeks before being forced onto the Trail of Tears. The gorge was later designated a National Natural Landmark in May 1974. In 2001 it appeared on screen as Late Cretaceous New Mexico in the Discovery Channel documentary When Dinosaurs Roamed America.

The canyon's name comes from the dismalites, the blue-green glowing larvae found on its walls, which visitors view on guided night tours. The Chickasaw were held captive here for two weeks before their forced journey along the Trail of Tears. The canyon also served as a filming location for the Discovery Channel documentary When Dinosaurs Roamed America, in a segment set in Late Cretaceous New Mexico.

Entry is charged, and the canyon is run commercially within an 85-acre (34 ha) preserve near Phil Campbell. Night tours are offered to see the dismalites, and camping is available in traditional campsites or cabins. Trails pass wet rock and moss, so wear shoes with good grip.

The larvae of Orfelia fultoni, called dismalites, glow blue-green to attract prey and mates and cover the canyon walls. They are distant relatives of New Zealand's Arachnocampa glowworms. Night tours are run to see them, and the canyon is one of only a few places where they occur.