The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

Son River and Catholic Church in the Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

Cavers in Hang Roc (Ruc Mon) cave in Phong Nha, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

Sunset over the Son River in the Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia

Linh Phong Buddhist temple, Dalat, Vietnam, Indochina, Southeast Asia, Asia

Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Dinh Son Phong Temple, Hoi An, Quang Nam Province, Vietnam

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

River boat on the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Three Go-go girls in front of a nightclub, Patpong, red light and entertainment district, Bang Rak district, Bangkok, Thailand

Three Go-go girls in front of a nightclub, one woman holding a sign, Patpong, red light and entertainment district, Bang Rak district, Bangkok, Thailand

Three Go-go girls in front of a nightclub, Patpong, red light and entertainment district, Bang Rak district, Bangkok, Thailand

Xoi chien phong or deep fried sticky rice cake, an authentic traditional vietnamese street food and local delicacy. Ninh Binh, Vietnam, Asia

Hang Son Doong, located in Phong Nha Ke Bang National Park, Vietnam, is home to a high quantity of rare cave pearls.

A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.

A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.

A caver is dwarfed by massive stalagmites in Hang Son Doong. Light can be seen coming in in the distance through the frist doline which is over 3 km away. Hang Son Doong is located in Phong Nha Ke Bang National Park, Vietnam.

Cave explorers illuminate a large passage in Hang En, Phong Nha Ke Bang National Park, Vietnam.

A cave explorer overlooks camp for the night from a high vantage point in Hang En, Phong Nha Ke Bang National Park, Vietnam.