The Great Wall of China is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe.
The tower is one of three structures in the Pisa's Cathedral Square (Piazza del Duomo), which includes the cathedral and Pisa Baptistry.
Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona.
The Eiffel Tower is the man-made structure made of steel and located in France's capital Paris.
The Grand Kremlin Palace is a building in the Moscow Kremlin. For much of the 19th century, it served as the official residence of the Russian emperor in Moscow.
Nestled in the Himalayas, Mt. Everest is the tallest mountain in the world, which is also a popular destination for climbers.
The Terracotta Army is a collection of terracotta sculptures depicting the armies of Qin Shi Huang, the first emperor of China.
Chichén Itzá was a large pre-Columbian city built by the Maya people of the Terminal Classic period.