The opulent car collection of an eccentric Sheikh housed in his own private pyramid.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This indoor ski resort has a mountain contained inside a mall.

Whitewashed mosque contains the world's largest carpet.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

This enormous sports car themed amusement park is home to the world’s fastest roller coaster.

The world’s largest LED display, built over an F1 race circuit.