The site even houses a sophisticated ancient observatory that exhibits the excellent advanced astronomical knowledge possessed by the Maya people. There are 91 steps on each of the four sides and the platform at the top serves as the 365th step. It has 365 steps for each day of the year. The Temple of Kukulkan in Chichen Itza is an archeological marvel based on Maya astronomy. The Colosseum had the capacity to host about 80,000 spectators andВ 80 entrances at the time of its construction. The labor of tens of thousands of slaves were used to build this magnificent structure. Domitian, another emperor of the Flavian dynasty later made certain modifications to the amphitheater. The Colosseum's construction was initiated in AD 72 by Emperor Vespasian and was finished by AD 80 by his successor, Titus. Constructed from concrete and sand, it is the largest amphitheater in the world. Sometimes called the Flavian Amphitheatre, the Colosseum is an oval-shaped amphitheater in the center of the city. Rome, Italy, hosts the Colosseum, which is one of the world's seven wonders. Today, it attracts 7 to 8 million annual visitors each year.

In 1983, the Taj Mahal was inscribed by the UNESCO as a World Heritage Site. The monument changes color depending on the time of the day and the moon. 28 types of precious and semi-precious stones were used to decorate the Taj Mahal. The construction of the temple cost the equivalent of US$827 million today.

It took 17 years, 22,000 laborers, stonecutters, painters, and embroidery artists, and 1000 elephants to complete the Taj Mahal. The construction of the Taj Mahal was completed by 1632.

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