When one starts recalling the names of the topmost architectures of the world, to his dismay, the list of structures does not end. The beautiful architectures capture the mind and one becomes befuddled with the actually the best ones. Here are a few names which can lend a helping hand to your thought:
Sydney Opera House:

Added to UNESCO Heritage Site on 28th June 2007, Sydney Opera House is a center for performing arts offering multiple venues. It is located on Bennelong Point in Sydney. The acts contrary to its name by not only housing an opera centre but also several separate venues.
Eiffel Tower

Located on the Champ de Mars in Paris, this 19th century iron lattice tower has become one of the most recognizable structures of the world. In addition to this it has also attained the honor of being the ‘global icon of France’. The tower was named after its creator Gustave Eiffel and was built as the entrance arch for the 1889 World’s Fair. It stands high at 324m almost measuring the same as an 81-story building.
The Palm Island

The Palm Islands is a group of artificial islands in Dubai. Embedded with major residential and commercial infrastructures, the islands are developed by Belgian and Dutch dredging and marine contractors.
The Golden Bridge

It is a suspension bridge straddling the Golden Gate which opens the San Francisco Bay into the Pacific Ocean. It has become an international symbol of San Francisco and California. It is the second largest suspension bridge.
Petronas Twin Towers

Petronas Twin Towers are the tallest twin buildings in the world. Located in Kuala Lumpur in Malaysia the towers feature a sky bridge between two towers. Tower one are fully occupied by the Petronas and its subsidiaries and the tower two is mostly occupied by the lease members of other companies.
London Eye

The London Eye is the largest Ferris wheel in Europe at a height of 135 meters. It is the most renowned paid tourist destination and attraction which magnetizes over 3 million people from all over the world.
CN Tower

This communications and observation tower in Toronto, Canada stands 553.3 meters tall. It had been holding the record of tallest free standing structures for 31 years till 12th September 1975 when it was surpassed by Burj Dubai.
The Atomium

Designed by Andre Waterkeyn, the monument forms the shape of a unit cell of an iron crystal magnified 165 billion times. It was built for Expo’58 and stands 102 meters tall with nine sphere wheels connected.