Catacombs turned marketplace.

Hear the quietest sound from across the dome.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

A historic house left in "dramatic still life."

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The curios of pharmacist and collector Henry Wellcome.

A student driver's nightmare.

An unusual round church in London with a Templar past.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

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

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 Harry Potter films.

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

This mysterious abandoned fort looks like something pulled right from Arabian legend.

This bazaar is one of the oldest in the Arabian world.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

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

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

A faithful reproduction of Al-Jazari's enormous water clock.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Singapore's landscaping project is home to 18 incredible Supertrees.

A battle between nature and architecture in the Cambodian jungle.