"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

This ancient holy well is older than much of the city that surrounds it.

A doctor had this large tub carved into rocks to facilitate easier seawater bathing.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

The ruins of a once-mighty medieval palace are hidden away in otherwise modern London

Murals of the wild parties once held on the frozen River Thames.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The Tudor-style cottage in the middle of the square is not quite what it seems.

An oddity of a bygone era that stills functions today.

Tucked away in a London Tube station, this 1920s linear clock shows the time across the world all at once.

The secret wartime bunker built on the platforms of an abandoned Tube station.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The commemorative stone column conceals a secret laboratory.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

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

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

This hidden green space is the city's second largest conservatory.

This sprawling, Brutalist estate feels like a city within a city.

Hidden beneath the streets of London is a secret subway that only carried mail.

Its collection includes a broad array of social, geographic, graphic design, and political history.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

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

This 500-meter-long memorial pays tribute to the hundreds of thousands of lives lost to COVID-19 in the UK.

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