7 Of America’s Most Eerily Beautiful Lava Tubes

For most hikes, the destination — whether it be the top of a dramatic cliff or the foot of a tall waterfall — is the reward.

But then there are lava tube hikes, where passing through and exploring the mysterious and alluring caves is the reward.

Lava tubes are cavernous tunnels that formed long ago when the outermost layer of a lava stream crusted, enclosing the fiery flow beneath. When the lava flow eventually drained by oozing through natural openings or rupturing through the surface, it left behind dark passageways with twists, turns read more >>>

Source : HuffingtonPost.Com

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