Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

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

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

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

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

An 18th-century religious argument etched into stone.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

One of the first monuments dedicated to the accomplishments of the great Vice Admiral, Horatio Nelson.

The largest terracotta fountain in the world, built to commemorate Britain’s Victorian achievements.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Largest lake in Great Britain measured by surface area.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

Once considered one of the country's finest motte and bailey castles.

Spain's largest bullring offers a unique glimpse at architecture and history.

A monument to one of the greatest matadors of all time.

The world's largest wooden structure.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

A plaque on the base of this statue holds a bewitching design.

The oldest operating pharmacy in the world features 800-year-old recipes.

Drink wine handed out through a window as part of an age-old tradition.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The attic of a four-century-old canal house hides a clandestine church.