Machu Picchu, Peru
It was abandoned during the Spanish conquest and remained hidden from the outside world until its rediscovery by American historian Hiram Bingham in 1911.
El Castillo, the central pyramid at Chichen Itza, demonstrates advanced astronomical knowledge. During the spring and autumn equinoxes, the setting sun casts a shadow on the pyramid, creating the illusion of a serpent descending the staircase.
Roman Colosseum, Italy**: - Also known as the Flavian Amphitheater, the Colosseum could hold up to 80,000 spectators and was used for gladiatorial contests, public spectacles, and other events. - It was built using travertine limestone and concrete, and its construction was completed in AD 80.
The Taj Mahal was constructed over a period of 22 years, employing thousands of artisans and craftsmen from across the Mughal Empire. - It's considered a masterpiece of Mughal architecture, blending elements from Persian, Islamic, Indian, and Turkish architectural styles.