Ape Cave, Lava tube in Washington
Ape Cave is one of the longest lava tubes in North America.
The cave was formed nearly 2,000 years ago from an eruption of Mount St. Helens.
Its name derives from the early exploration by a group of Boy Scouts called the Mount St. Helens Apes.
Visitors should bring headlamps and warm clothing to explore the cave.
The cave remains at a constant temperature of 42 degrees Fahrenheit year-round.
Location: Washington
Source: Wikimedia
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