One of Edinburgh's most popular works of street art is located well off the beaten path.

A former telephone box found new life as a photo booth and charity fundraiser.

An iconic red telephone box turned tiny art gallery.

Neon artworks light up this dark Edinburgh tunnel.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

This extraordinary Viking artifact has traveled throughout the city.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

Enter this small nook and you'll be surrounded by 360 degrees of street art.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

An American ghost town hides along a side street in Scotland's capital.

The colorful stairs are made with marble from the world's major quarries.

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

The Scottish Reformation leader's grave was paved over and is now a parking lot.

Now home to a drinking establishment, this building has a macabre history.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

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.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

An eerie collection of the surviving structures from a past celebration of the future.

The world's largest wooden structure.