A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

These ornate arches show how the course of the River Thames has changed.

A series of carved figures that scandalized British society.

England's most famous front door has an accidental doppelganger.

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

A measuring mishap led to these artificial stone ladies losing their stomachs.

This statue includes the molehill that toppled a king.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This third-generation institution is one of the last in London that still cures its own salt beef for epic sandwiches.

This 19th-century pub features stained-glass windows celebrating Victorian-era “champions.”

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

This London marker celebrates the spot where the world-famous English band was founded.

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

This overlooked street light once served as a KGB dead letter box.

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

A much-loved local landmark pays tribute to the shipbuilding past of this area.

Inside this Krakow church, an explosion of psychedelic color.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

The silly symbol for an underground protest group is now scattered around the city.

A striking public sculpture representing the period of martial law in Communist Poland.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.