This photo of the New Zealand glowworms (Arachnocampa luminosa) captures one of the most magical moments I witnessed so far. It took some time to persuade my wife to join me through the waters after the entrance - but it was worth it (luckily, the eels only lived in the pools deeper in the cave)... My images from that series were featured multiple times by National Geographic, Expedia and others.
Camera triggered remotely via app, 84sec exposure time.