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

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.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A sweet symbol marks the place where torturous executions were once carried out.

The final resting place of soldiers' loyal canine companions.

An unusual round church in London with a Templar past.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

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

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

Oldest synagogue in the United States.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

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

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

This old-fashioned carhop restaurant gave the world the waffle cone.