Famous Landmarks
The Eiffel Tower
A "temporary" 20-year structure that Paris just... never took down, and is now unimaginable without.
The Great Wall of China
A 2,000-year, multi-dynasty construction project so vast that no one has ever fully agreed on exactly how long it actually is.
Machu Picchu
A royal Inca estate so well-hidden in the Andes that the Spanish conquistadors never even found it.