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

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

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

Why walk on this historical site when you can zoom down instead?

A historic house left in "dramatic still life."

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

The medieval network of canals hidden underneath the city is opened to explorers each year.

This long-distance walking route follows the Prime Meridian line as it passes through England.

A plaque marks the underground site of one of London's "lost rivers."

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

The Buddhist temples of Yamadera, built into a mountain side, feature a viewing deck with sweeping views.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The television series' iconic giant foot was borrowed from this classical painting.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

An unusual round church in London with a Templar past.

The signs of a long buried road can still be found hidden beneath a London sewer grate.