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

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

The bronze uniforms commemorate the vital role of women during World War II.

The last four extravagant street signs of London's historic banking street.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

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

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

A memorial for public executions that dates back to the 14th century.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

This Roman relic was discovered in Scotland by a mudlarking ferryman.

This early version of the guillotine was used to execute the man responsible for its construction.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

Inscribed on the gate are the names of 29 figures from the University's first five centuries.

An 18th-century lighthouse built on a 16th-century castle is now a monument to the maritime beacons of Scotland.

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

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.

The final resting place of soldiers' loyal canine companions.