The secular incarnation of a religious meditation.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Neglected resting place of some of the city's early luminaries—and a woman encased in concrete.

The former Willingdon Airport started operations in 1929, in India's capital, Delhi. Now, it's used for maintenance runs and helicopter rides.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.