The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

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

The final resting place to 300 Victorian-era pets hides inside the city park.

An incarceration museum on the spot of possibly the oldest prison in England.

Dictionary Johnson’s favorite feline.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

The remains of Crystal Palace Great Exhibition of 1851.

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

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

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

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

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

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

The only museum with its curator—and her pets—buried inside.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

A modern sliver of architecture in Roma.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.