A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This archaeological site was once a grand city of the Indus Valley Civilization with a sophisticated system for conserving water.

An unassuming tomb houses an important milestone in Indian architectural history.

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

The first English fort built in India.

The last remaining colonial-era Italian church in Old Goa.

The roof of one of the world’s largest spice markets provides a grand view over the neighborhood's glorious bustle.

This 15th-century mosque is a beautiful blend of Hindu and Islamic architecture.

Known as the "Queen of Beach Markets," Calangute epitomizes Goa's beach flea market scene.

The place of worship for Zoroastrians, Mumbai's Parsi fire temples use fire and ash for purification.

An effigy of the deity emerges from a temple's water every 40 years.

Kolkata’s only Portuguese church has a curious link with chickens.

This sprawling stronghold has been at the center of some of South India's bloodiest wars.

This restaurant is proud to be built atop a burial ground.