Just another ancient, mysterious Irish stone circle.

This Irish museum in a historic 19th century market pays tribute to the glory of butter.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

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

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

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

The television series' iconic giant foot was borrowed from this classical painting.

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

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

This knockout museum lies in a sleepy corner of London.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

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

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

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

A plaque marks the underground site of one of London's "lost rivers."

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

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

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Charles Babbage's proto-computer, painstakingly brought to life.

London's smallest police station is barely the size of a phone booth.