This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This historic building displays the remains of a victim of the devastating 14th-century plague.

Pop culture has helped to keep this iconic British building from being destroyed.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The best place in the world to buy tinned fish.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The geoglyph once sported a glass bottle eye.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

Preserved behind glass, the ruins of a medieval building used to store human remains.

A celebrated bandstand at the center of what was once the worst slum in London.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

An unassuming London park is actually a pilgrimage site for modern clowns.

The pockmarks across the building's facade are remnants of the Blitz.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.