Northern Ireland's Brobdingnagian stepping stones.

It was once nicknamed "the most bombed hotel in Europe."

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

For part of the year, this innovative greenhouse is painted white to keep the plants from getting scorched.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

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

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

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.

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

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

This historic abandoned train station looks like a stop for ghost trains.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

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