Title: Man-made wonders
Description: Discover the greatest man-made wonders the world has to offer, from the Empire State Building to the Sydney Opera House and from the Eiffel Tower to the Large Hadron Collider. Get up close to their unique features and marvel at their breathtaking dimensions. What threats and challenges to these special phenomena face, and what is being done to ensure their survival for future generations to enjoy.
Subjects: Curiosities and wonders, Modern Architecture, Historic buildings