An eerie, derelict amusement park in Berlin.

A part of the world's largest marsh seems to be growing bright red Martian grass.

Intensely colorful calcite pools in Southern China.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

This abandoned fishing settlement may well be the greenest village in the world.

This home on a quiet suburban street is completely covered with vibrant mosaics.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Giant, friendly pelicans in Central London, the most unlikely of places.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

The largest of London's subterranean rivers and once a mad, bad center of London life.

A cluttered and astounding collection of antiquities and curiosities.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

London's smallest police station is barely the size of a phone booth.

Remnants of a Victorian garden feature sitting in public woodland.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

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

A student driver's nightmare.

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