This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

This 11th century tower is said to be the oldest building in Oxford.

A plaque is all that remains of a lost Oxford transport hub.

The remnants of this unusual bridge await an uncertain fate.

A hidden plaque is the only reminder of the lost palace where two storied English kings were born.

One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

The beautiful non-repeating pattern honors the Oxford professor who discovered it.

A little piece of Oxford's overlooked industrial heritage.

A letterbox installed specifically for the first editor of the Oxford English Dictionary.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

This unassuming building produced some of the world's most famous bells.

It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Tourists who rely on a transit map to find the iconic Beatles location often end up in a far-off neighborhood.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

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

These morbid carvings remind churchgoers of the inevitability of death.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.