This Toronto observation tower was once the world's tallest freestanding structure.

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Your new ahaCN Tower

The CN Tower was built to improve telecommunications above Toronto's growing skyline. Source: CN Tower ↗

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23This Australian performing-arts building is recognized by its sail-shaped roofs beside the harbour.RECALL
Sydney Opera House
The Sydney Opera House's distinctive sail-shaped roofs took far longer to complete than originally planned.
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24Frank Lloyd Wright placed this Pennsylvania house directly over a waterfall.RECALL
Fallingwater
Frank Lloyd Wright's Fallingwater was built dramatically over a natural waterfall in rural Pennsylvania.
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25Frank Gehry's titanium-clad museum helped transform the profile of its Basque host city.IDENTIFY
Guggenheim Museum Bilbao
The Guggenheim Bilbao's flowing titanium curves are widely credited with transforming the fortunes of its host city.
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