The world's second-largest sundial, made entirely out of stone.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Temples adorned with intricate, erotic sculptures make up one of the "seven wonders" of India.

A huge cathedral single-handedly constructed by one eccentric monk.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Commonly acknowledged as the only public monument to the Devil himself.

The earliest known map to show America, discovered by accident at a Paris bookshop.