What happens when there is no natural wonder to gawk at? Take a tour of these world-class attractions

World is filled with engineering and technological marvels that make great vacation destinations.

From The Sphere concert venue in Las Vegas to the Golden Gate Bridge in San Francisco , these amalgamations of imagination, technological wizardry, and engineering mastery impress nonetheless.

The largest particle accelerator on earth is a 17-mile ring buried 328 feet below ground outside of Geneva , Switzerland .

The Bailong Elevator in Hunan , China , is the tallest outdoor elevator in the world.

The National Stadium of Beijing , affectionately known as the Bird 's Nest , stands out with its unique design.

The Burj Khalifa in Dubai is distinctive for its architecture and incredible height.

A total of 21,000 men labored on the dam during its five-year construction process.

The Chunnel connects Folkestone, England to Sangatte , France via a train tunnel burrowed into the seafloor of the English Channel .

The Golden Gate Bridge spans the width of the Golden Gate strait , which connects San Francisco Bay to the Pacific Ocean .