There are hidden patterns on the subway seats of some Stockholm metro cars.

A miniature model of the iconic Stockholm department store.

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

The oldest Muslim cemetery in Singapore, with a strong royal connection.

Watch butterflies take flight before you fly.

This urban stream flowing underneath Tasmania's capital city is also an unofficial gallery for street artists.

The original attack periscope from a 1940s navy submarine towers high at this memorial site.

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

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

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

Legend has it this gnarled old tree was planted by Tsar Peter the Great during his visit to London.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

This underpass became an unlikely piece of cinematic history after its appearance in 'A Clockwork Orange.'

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This peaceful park with centuries of history hides in an overlooked section of South London.

A wonderfully preserved example of London's 1960s-style high-density, low-rise public housing.

Legend says entire herds of cattle have disappeared within this boulder-strewn landscape.

A small, but award-winning beach known for its literally spotless reputation.

A monument to the moth that saved Australia from a cactus crisis.

This former psychiatric hospital was once one of the largest in Australia.

This arch celebrates the romantic memories of those who danced at the Cloudland Ballroom.

On the outskirts of an opal-mining town, these baths fed by a massive underground aquifer are a natural spa.

Thousands of used shoes create a unique public art exhibit along this old paddock fence.

Once an aquarium, this sanctuary now rescues sharks and rays from fishing nets.