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More than 7 million people are living on Earth now. UN estimates that by 2050, the world population will grow to 9 million. This indicates that more structures must be built to provide shelter to these people. Architects are designing new buildings with unique features and appearance. In the past, many structures were built which people still appreciate. Here are some of the most beautiful structures we have ever seen.

Leaning Tower of Pisa, Italy

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The construction of this seven stories high bell tower started in 1172 AD. It took 199 years to complete. The tower is 58 meters high, and it began to sink into the ground since its construction. Between 1990 and 2001, the 5.5-degree angle lean was reduced to 3.99 degrees for safety reasons. This structure is now an inspiration for many architects around the world.

Great Pyramid of Giza, Egypt

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It was built in 2560 BC. It is considered to be one of the Seven Wonders of the World. This mass stone creation was constructed from 2.3 million limestone blocks. These blocks are still intact. It only took 20 years to construct the pyramid. This was possible due to the work of thousands of slave workers and technology that no one yet understood.

The Great Colosseum, Italy

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The construction of this structure started in 70 AD under Emperor Vespasian. It was completed in 80 AD. It was then inaugurated by Vespasian’s son Titus. More than 9,000 animals were slaughtered during the Inaugural Games. It was the largest amphitheater built in the Empire.

These structures always inspire the architects to be creative and do better work. These buildings still stand the test of time.

3 beautiful old structures that stand the test of time

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