The Aspire Tower (Torch Hotel), currently the tallest structure in Doha, Doha, Qatar, Middle East

Construction of the Burj Dubai (Dubai Tower), set to be the world's tallest building and the centerpiece of the Gulf region's most prestigious urban development called Downtown Dubai, Dubai, United Arab Emirates, Middle East

The TV tower, the fourth tallest structure in Brazil, towers above the monumental axis, Brasilia, Brazil, South America

Construction of the Burj Dubai (Dubai Tower), set to be the world's tallest building and the centerpiece of the Gulf region's most prestigious urban development called Downtown Dubai, Dubai, United Arab Emirates, Middle East

The TransAmerica Pyramid, at 260m the tallest building in San Francisco, California, USA

World Trade Center Phase 3 building, at 330m Beijing's tallest building, Guomao district, Beijing, China, Asia

Burj Khalifa, the tallest man made structure in the world at 828 metres, viewed from the Palace Hotel, Downtown Dubai, Dubai, United Arab Emirates, Middle East

The Burj Khalifa, completed in 2010, the tallest man made structure in the world, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, and Dubai Mall, Downtown Dubai, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, and Dubai Mall, Downtown Dubai, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, and Dubai Mall, Downtown Dubai, Dubai, United Arab Emirates, Middle East

World Trade Center Phase 3 building, at 330m Beijing's tallest building, in Guomao CB, Beijing, China, Asia

Burj Khalifa, the tallest man made structure in the world at 828 metres, Downtown Dubai, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, viewed from the Palace Hotel, Downtown Dubai, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, Downtown Dubai, Dubai, United Arab Emirates, Middle East

The Berlin TV Tower (Fernsehturm), built in 1969 by the East German government, 1207 feet high and the tallest structure in Germany, Berlin, Germany, Europe

TV Tower in Zizkov at sunset, Prague, Czech Republic (Czechia), Europe

Cairo Tower, the tallest structure in Egypt and North Africa, rising 187 meters, Nile River, Cairo, Egypt, North Africa, Africa

Cairo Tower, the tallest structure in Egypt and North Africa, rising 187 meters, River Nile, Cairo, Egypt, North Africa, Africa

The Burj Khalifa, completed in 2010, tallest man made structure in the world, Dubai, United Arab Emirates, Middle East

The Burj Khalifa, completed in 2010, the tallest man made structure in the world, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, Downtown Dubai, Dubai, United Arab Emirates, Middle East

Burj Khalifa, the tallest man made structure in the world at 828 metres, and Dubai Mall, Downtown Dubai, Dubai, United Arab Emirates, Middle East

One World Trade Center also known as Tower 1 and Freedom Tower, Manhattan, New York City, New York, USA

One World Trade Center also known as Tower 1 and Freedom Tower, Tower 7 on right, Manhattan, New York City, New York, USA

One World Trade Center also known as Tower 1 and Freedom Tower, Manhattan, New York City, New York, USA

Burj Khalifa skyline tallest building in the world from above at night in Dubai, United Arab Emirates, Asia

Dubai Burj Khalifa skyline tallest building in the world downtown at night in Dubai, United Arab Emirates, Asia

Qutub Minar, the tallest minaret in India, UNESCO World Heritage Site. Qutub Complex, Delhi, India, Asia

Washington Monument, Washington, District Of Columbia, United States Of America

Sunset, Toronto, Ontario, Canada