All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

This is Britain's one and only clock concealed in the pavement.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The gigantic preserved heart of a champion racehorse.

A moving memorial to the fallen and missing from WWI trenches.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A rare example of World War I trenches from the British front.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This site contains preserved ruins and industrial remnants of Western Australia's mining heritage.

The 18th-century home was disassembled into 253 cases and brought all the way from the other side of the world.

This giant, granite purse is one of Melbourne's most unique and distinctive pieces of public art.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A memorial for public executions that dates back to the 14th century.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This Underground station has been a popular filming location for decades, even before it closed.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

A youth-centric science center hides an industrial triumph.