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The towering limestone
monolith, hides a labyrinth
of spectacular caves,
and natural tunnels. hides a labyrinth
of spectacular caves,
and natural tunnels. But there is also evidence
of human activity
below ground. [Pete] You see the original
drill marks, as the tunnel being made
in the 1700s
monolith, hides a labyrinth
of spectacular caves,
and natural tunnels. hides a labyrinth
of spectacular caves,
and natural tunnels. But there is also evidence
of human activity
below ground. [Pete] You see the original
drill marks, as the tunnel being made
in the 1700s
Full Transcript
00:00:01.000 --> 00:00:03.199
The towering limestone
monolith,
00:00:03.199 --> 00:00:07.033
hides a labyrinth
of spectacular caves,
and natural tunnels.
00:00:07.033 --> 00:00:08.999
hides a labyrinth
of spectacular caves,
and natural tunnels.
00:00:08.008 --> 00:00:13.999
But there is also evidence
of human activity
below ground.
00:00:15.633 --> 00:00:17.299
[Pete] You see the original
drill marks,
00:00:17.299 --> 00:00:20.001
as the tunnel being made
in the 1700s.
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Movie Summary
The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins.