Chelsea's soldiers were given strict orders when crossing this historic bridge.

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

The bones of two medieval royal lions were discovered at the historic fortress.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

An architectural oddity hides in plain sight on this iconic London bridge.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

The house where the writer spent his formative years.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This giant roadside fruit is home to an array of apple-based treats.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

Possibly the world's largest coin stands just outside of a Canadian science center.