The Colosseum

The Colosseum was built in 70-80 AD and is located in Rome, Italy. It is an oval amphitheater that could hold 50,000-80,000 spectators. The Colosseum was used for mock sea battles, gladiatorial events, public speakings, executions, animal hunts, and theatrical events. The Colosseum has been partially ruined due to earthquakes and stone robbers, but it still remains an iconic symbol of Imperial Rome.

Burj Khalifa

The Burj Khalifa is located in Dubai, United Arab Emirates and was completed on December 2, 2009. Burj Khalifa is the worlds tallest building standing at 2,722 feet tall. The second tallest building in the world is Shanghai Tower standing at 2,073 feet tall. It took 1.5 billion dollars to build the Burj Khalifa.

Leaning Tower of Pisa

The Leaning Tower of Pisa is located in Pisa, Italy and was complete in 1372. It began to lean during construction due to an unstable foundation on too soft ground. The building continued to tilt until the late 20th century when it was stabilized. the tower is displaced 12 feet 10 inches. The height of the tower is 183.27 feet tall.

Big Ben

Big Ben is located in London England and was completed in 1855. It was originally referred to as "the clock" or "clock tower". It is on the north end of the Palace of Westminster. When it was completed it was said to be the biggest, most accurate four-faced striking and chiming clock in the world.

Capital Gate

Capital Gate is located in Abu Dhabi, United Arab Emerites. It was completed in 2011 and stands 35 stories tall. It holds the world record for the farthest leaning man made tower, leaning at 18 degrees to the west. This design allows the building to absorb forces created by wind and seismic activity. Capital Gate now houses the 5-star Hyatt hotel and other office spaces.

Cathedral of Brasilia

The Cathedral of Brasilia is a Roman Catholic cathedral located in Brasilia Brazil. It was completed on May 31, 1970 and it took 12 years to complete. The cathedral is a hyperboloid structure that is constructed from 16 concrete columns. Each of these columns weighs around 90 tons and are the supports for the building.

30 St Mary Axe

30 St Mary Axe, or The Gherkin is a commercial skyscraper located in London's primary financial district. The building opened in April of 2004, and stands 41 stories tall. The tower gets its name from the street that it is located on, St Mary Axe. Today 30 St Mary Axe is one of London's most recognizable structures and has become a widely recognized example of contemporary architecture.

The Lotus Temple

The Lotus Temple Baha'i House of Worship located in New Delhi, India. It opened in December of 1986 and is one of the most visited edifices in the world. On average 8,000 to 10,000 people visit the temple every day. In 2001 CNN reported that the Lotus Temple was the most visited place in the world. The architecture of the building was designed to represent a lotus flower. The chose a lotus flower because it is common in several religions including Hinduism and Buddhism.

Taj Mahal

The Taj Mahal was completed in 1653 and it took 21 years to complete the building. The Taj Mahal is made out of ivory-white marble and it was built at a cost of an estimated $827 million. Shah Jahan had the Taj Mahal built as a mausoleum for his favorite wife. The building also houses a mosque and guest house. It is located in Agra, India and it gets between 7 and 8 million visitors a year.

Eiffel Tower

The Eiffel Tower was constructed in 1889 and was the entrance to the 1889 World's Fair. The Eiffel Tower was named after the lead engineer, Gustave Eiffel, who designed it. The tower is the tallest building in Paris at 1,063 feet tall. Today the Eiffel Tower is the most-visited paid monument in the world. The tower has three levels for visitors, two with restaurants, and the highest one being 906 feet from the ground.

Sydney Opera House

The Sydney Opera House was opened on October 20, 1973. It was designed by Jorn Utzon in 1958. Today the Sydney Opera House is the third largest opera house in the world. It has over 1,500 performances annually attended by more than 1.2 million people. Also, over 350 thousand  people tour the opera house every year. The opera house has a total seating capacity of 5,738 in all six of its theaters.

The Louvre

The Louvre is the world's largest and second most visited museum located in Paris France. The Louvre gets around 9.2 million visitors a year. The Louvre opened on August 10, 1793 and is housed in the Louvre Palace. When The Louvre opened it had 537 paintings and  were either royal property or confiscated church property. The museum today consists of more than 380,000 objects and 35,000 works of art.