Chelsea's soldiers were given strict orders when crossing this historic bridge.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

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

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

An unusual round church in London with a Templar past.

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

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

The mummified relic of St. Antoninus.

For many years, the river that Julius Caesar led his army across into Italy was lost until re-identified.

For hundreds of years, this huge figure has been blessing visitors before they explore his body.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

Unscathed for almost 2,000 years, the best preserved Roman triumphal arch is in a small southern Italian city.

During World War II, the Shroud of Turin was secreted to this remote southern Italian complex.

When the rain falls, this drain system turns into a musical instrument.