A quiet memorial to those who died saving others in the heart of the City of London.

Public access to clean drinking water was an instant hit among the masses.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The last bastion of Roman presence north of the Alps looms over a German town.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

The world's largest grapevine has produced a delicious harvest at Hampton Court Palace for almost 250 years.

Follow the original medieval paths that wind through this intriguing section of the city.

The birthplace of the builder of the Statue of Liberty is now a museum dedicated to his work.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

There has been an astronomical clock on this spot since the 14th century.

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

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

The anatomical-pathological collection of a man who changed surgery.

London's smallest police station is barely the size of a phone booth.

Where Venice's gondolas go for a tune-up.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.