Contrary to the belief that the Great Wall of China is a single, continuous wall, it is actually a series of walls and fortifications, with some sections being built as early as the 7th century BC.
During the summer, the iron structure of the Eiffel Tower can expand, making it up to 15 cm taller due to thermal expansion.
The statue was gifted to the United States by France in 1886 to commemorate the centennial of American independence. The statue's full name is "Liberty Enlightening the World."
With an area of just 44 hectares (110 acres), Vatican City is the smallest independent state in the world. It's also the spiritual and administrative center of the Roman Catholic Church.
The picturesque island of Santorini in Greece was formed from a massive volcanic eruption around 3,600 years ago. The island's unique white-washed buildings are designed to reflect sunlight and reduce heat.
Niagara Falls has frozen over on rare occasions, creating stunning ice formations. The most famous incident was in 1848 when an ice jam temporarily stopped the flow of water.
The Colosseum in Rome was used for various events, including gladiator contests and animal hunts. It could be flooded to host naval battles, thanks to an intricate system of tunnels and hydraulic machinery.