1. The Hang Son Doong cave, Vietnam
The Son Doong cave in Vietnam is the largest currently known cave in the world. It is
filled with countless wonders including isolated ecosystems, weather systems and
2. Mendenhall Glacier Cave, USA
This ice cave is part of the Mendenhall Glacier near Juneau, Alaska. The spectacular cave
was carved out of the glacier by melting ice water. Due to the ever-changing conditions at
glaciers, it is unclear whether this cave will still be around for long.
3. Marble Caves, Patagonia
The Marble Caves in Patagonia are known for the spectacular reflections that the
turquoise water casts on the white marble ceiling of the cave. They are also called the
Marble Cathedral because of their beautiful and arching forms.
4. Fingal’s Cave, Scotland
Although it may seem like this block structure is man-made, it was actually formed by
hexagonally jointed basalt columns within a Paleocene lava flow. The cave’s size and
naturally-arched roof plus the eerie sounds made by the waves above the cave roof is
perfect for cathedral-like atmosphere.
5. Glowworms Cave, New Zealand
The Waitomo glowworm caves in New Zealand are home to a unique insect – the
glowworm. This insect hangs glistening silken strands from the ceiling of the cave and
glows to attract unsuspecting prey, creating a breath-taking starry effect.
6. Naica Mine, Mexico
The Naica Mine caves in Mexico are home to some of the largest crystals ever seen. The
Crystal Cave, where these crystals are located, is closed to the public because of its depth,
heat and other issues. However, plenty of pictures have been taken to document this
monumental crystal cavern.
7. Ellison’s Cave, USA
8. Reed Flute Cave, China
The Reed Flute Cave in Guangxi, China has been visited by tourists for at least 1200 years.
The cave is home to a spectacular array of stalagmites and stalactites. It is named for the
reeds that grow at its mouth, which can be made into flutes.
9. Tham Lod Cave, Thailand
The Nam Lang River runs through the Tham Lod cave in northern Thailand. The cave is
filled with beautiful stalactites and stalagmites and is home to hundreds of thousands of
Pacific swifts that have adapted to spend parts of their lives in caves.
10. Vatnajokull Glacier Cave, Iceland
This cave is located in Iceland’s Vatnajokull Glacier, the largest glacier in Europe. Caves
like these form due to melting glacial ice water, but they can be dangerous because
glaciers are constantly breaking and changing. Those planning on travelling to Iceland should consider the weather when they are preparing for their trip; see this page for more information.