- Photo
- —
- Name
- —
- Comment
- Inca citadel at 2,430 m, abandoned within a century of being built and unknown to the outside world until 1911. Dry-stone masonry so precise the blocks need no mortar.
- Address
- Machupicchu District, Urubamba Province, Cusco Region, Peru
- Country
- Peru
- Built
- c. 1450
- Why
- Engineering and astronomy fused with a near-impossible mountain setting
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