The Eiffel Tower needs no introduction as we’ve all seen it a thousand times in pictures, movies and TV. The odd angle of this aerial photo makes the tower seem sideways and upside down but you can’t miss the great shadow.

Thanks: rob blum, Parker, Keith, Gonzalo & many others

This is the Sunsphere in the 1982 World’s Fair Park, Knoxville, Tennessee. It’s a 266 foot high structure, topped with a 74 foot sphere made of bronze-coated reflective glass.

The Sunsphere was featured in the Simpson’s once (Nelson accidentally toppled it), and there’s even a “religion” based around the tower, known as the ‘Church of The Giant Golden Microphone‘.

Thanks: Les Jones, Graeme M, Adrian Likins, Jud White, Terry Foster, Janssen McCormick

Very close to each other near Walnut Grove CA, are three utterly enormous communication towers. Firstly is the Channel 40 Tower which stands at 608.7 metres, then just a little South is the Hearst-Argyle Tower which stands at 609.6 metres (there’s actually 17 communication towers in the US at exactly 609.6 metres, presumably they’re all just the same kind?).

Finally we have the KXTV/KOVR Tower, an absolute behemoth of communications towers. Standing at 624.5 m the structure is taller than the CN Tower, and officially the 3rd largest structure in existence (the first two aren’t covered by hi-res images on Google yet). There’s loads more of these towers across the US, but they all start to look kind of the same after a while…

Thanks to Josh Kaplan.

The CN Tower and Rogers Centre (formerly the Skydome, home of the Blue Jays) are in downtown Toronto, Canada. Look for the tower’s shadow to see its shape.

Thanks: Mike Pegg, many others