The world’s second-largest flood defense barrier has protected London for decades.

Scotland's claim to the prime meridian was laid 200 years prior to the one in Greenwich.

The oldest floral clock in the world still functions today.

A haunting medieval cloister that once served as the friars’ burial ground.

The ground on which Shakespeare’s initial playhouse once stood.

The mysterious “claw marks” said to be left by the Devil on Pisa’s famous cathedral.

One of the first reinforced-concrete buildings built in the UK, now abandoned.

The (fictional) address of Sweeney Todd's bloody barbershop.

A celebration of Norwegian independence, or public art gone wrong?

This tomb of a Sufi mystic is a remnant of Ottoman rule in Hungary.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

A forgotten underground railway once whooshed trams beneath London.

An extended zoological collection that doubles as a time capsule.

This 42-foot tribute to the workforce still reminds us to pause and recharge.

A small but stubborn relic of Spain’s turbulent past hides in plain sight.

The last vestiges of a magnificent Victorian-era train station can be found in this pub.

Two of Manchester’s oldest buildings were moved twice.

A sculpture dedicated to this town’s rich shipbuilding heritage.

Tony Blair's garden gnome and a Howitzer shell-turned-flower-pot are on display in this deconsecrated 13th-century church.

This bronze statue honors one of the leaders of the suffragette movement in the United Kingdom.

A discarded umbrella stand from a women's prison is an object of pride at a library that is dedicated to women's culture and achievements.

For more than half a century, an enormous feline has watched over this London neighborhood.

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

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