Though these human-made islands were constructed as an escape for the wealthy, they rarely see many visitors.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Personal garden filled with mosaics made of recycled garbage.

A beautiful lighthouse with as many steps as days in the year, as many windows as weeks, and as many levels as months.

A statue erected in honor of the toadish nickname given to Jersey residents by the French.

Rare collection of medieval books under lock and key.

Long before mobile phones or GPS were available, these sentry boxes provided help for motorists in need.

Led Zeppelin wrote some of their most iconic songs at this little 18th-century Welsh cottage.

This magnificent blue mosque in Afghanistan is surrounded by thousands of white doves.

The only medieval bridge in Britain with its defensive tower still in tact.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The commemorative stone column conceals a secret laboratory.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Rebuilt remains of a temple to Roman god Mithras.

Underground monastery and fortress.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A famous burial ground with a history both grim and literary.

This may be the last of London's wooden pavements, which were once a common sight in the city.

A train ride to the middle of nowhere gives its passengers some of the most iconic views of Japan's seasons.

An anti-tank graveyard in the English countryside.

This former military airfield's claim to fame came from a lucky accident during the Second World War.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Where, exactly, the great aviator completed her transatlantic flight has caused some trouble in Wales.