Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

A medieval quay that was the Mayflower's final port of call before sailing for America.

A medieval cave used to shelter local hermits now holds nearly 200 old Quaker gravestones.

The Bristol Camera Obscura housed in an ancient windmill.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

The Great Fire of London and the regulation of one-way streets both started in this alley.

This Underground station has been a popular filming location for decades, even before it closed.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

The commemorative stone column conceals a secret laboratory.

A unique tribute to the millions of animals who served and died for the British military.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

A museum wholly devoted to juvenescence.

Pop culture has helped to keep this iconic British building from being destroyed.

Giant, friendly pelicans in Central London, the most unlikely of places.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Scattered throughout London are ancient remnants of the city's former bounding wall.

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

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

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

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Catacombs turned marketplace.