This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

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

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

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

A sweet symbol marks the place where torturous executions were once carried out.

The final resting place of soldiers' loyal canine companions.

The fountain marks the area where hundreds of accused witches were burned at the stake.

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

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

A massive Celtic cross secretly growing in an Irish forest.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The record holder for the world’s largest peach.

The tower was originally used as a chimney for the waste incinerator of St Johns Precinct and Market.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

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

Fulham F.C. imploded once everyone excised its giant, hated tribute to the King of Pop.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.