This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

The World Wide Web was created in this nondescript corridor at CERN.

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

An authentic, seaworthy replica of the ship that sailed to Newfoundland in 1497.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

The Bristol Camera Obscura housed in an ancient windmill.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

London's marvelous wildfowl reserve along the Thames.

A boiling wellspring flowing with natural gas burns in a continual blaze.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The history of Mar Behnam Monastery is that of violence, intolerance, resiliency, and spirituality.

An ancient sanctuary that has long been a holy site for the Chaldean Christian Church.

The sacred shrine of the Yazidis.

This beautiful arched gate is all that remains of the fortress the ancient mountaintop town of Amadiya once was.

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

An artistic tribute to the famous singer, just around the corner from where he was born.

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

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The ritual has been performed uninterrupted for nearly 700 years.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.