Underground artificial river in the ancient city.
Schlüsselwörter
artificial,
attraction,
beautiful,
cave,
cavern,
colourful,
dark,
deep,
earth,
geologic,
geology,
hall,
heritage,
to illuminate,
illuminated,
illumination,
interior,
karst,
landmark,
light,
mystery,
national,
natural,
nature,
old,
park,
petrified,
river,
rock,
stalactite,
stalagmite,
stone,
structure,
tour tourism,
travel,
underground,
waterfall,
wonder,
mexico,
water,
tunnel
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