Huge winged monument in the United Kingdom.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A million and a half tons of earth were used to create one of the world's largest land sculptures.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.