mortar, wheels, or iron tools · All Facts

mortar, wheels, or iron tools
Machu Picchu was built without mortar, wheels, or iron tools — the stones fit so precisely that you can't slide a knife between them.
SrcUNESCO

Next evidence →swims in the oceanThe Galápagos marine iguana is the only lizard that swims in the ocean — it dives up to 30 feet to feed on algae.

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More in South America

dilutes the ocean's saltinessThe Amazon River discharges so much water that it dilutes the ocean's saltiness for over 100 miles offshore.
massive geoglyphsThe Nazca Lines in Peru are massive geoglyphs — some over 1,200 feet long — that can only be fully seen from the air. Scientists still debate their purpose.
highest navigable lake in the worldLake Titicaca on the Peru-Bolivia border is the highest navigable lake in the world at 12,507 feet above sea level.
6% of the world's oxygenThe Amazon Rainforest produces about 6% of the world's oxygen and is home to 10% of all species on Earth.

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