Legend says the water within these mysterious sacred springs stays cold even when boiled.

A medieval abbey featured on 'Game of Thrones' that dates back to the 12th century.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

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

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

The most loyal of little dogs, or a Victorian era publicity stunt?

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The final resting place of soldiers' loyal canine companions.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

360° views of the city plus five floors of optical illusions and hands-on science.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

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

The quiet field that inspired one of the most famous songs of all time.

The Liverpool street made famous by the Beatles is real.

This slice of 1960s Danish modernism does not conform to the Oxford college stereotypes.

The spot where Oxford garnered its name was also home to a medieval philosopher and includes a house covered in statues.

The shop where the girl who inspired the beloved character once bought sweets is now a book-themed commercial curiosity.

Hidden in plain sight, this creepy sculpture watches from above.