A wooden street sign is the last remnant of this 400-year-old alleyway.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

It houses the remains of a 17th-century version of the Titanic.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

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

The fences outside some of South London's estates are made from recycled World War II stretchers.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Ship-sized kinetic sculptural fantasy.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A naturally mummified 2,000-year-old man.

Artists and musicians now rule over this former rail station.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A cluttered and astounding collection of antiquities and curiosities.

Hear the quietest sound from across the dome.

The anatomical-pathological collection of a man who changed surgery.