- [Narrator] It's taken 6,000 years for nature

to carve these remarkable formations.

The marble caves of Chile Chico are located

on a peninsula of solid marble bordering

a remote glacial lake that spans the Chile/Argentina border.

The lake is fed by rivers coming

from several surrounding glaciers.

As the glaciers melt and grow,

the waters slowly carve out the marble

leaving behind masterpieces fit for a museum.

These distinct bright blue waters are caused

by suspended particles from the glaciers

reflecting the blue part of sunlight.

Getting to this location isn't easy.

It's a long journey requiring a flight,

a 200-mile drive into the wilderness

and a boat ride just to get there, but it's worth it.

The remarkable swirling patterns on the cave

reflect the lake's blue waters changing

with the water levels and the season.

Nature truly is the greatest artist.