Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Hiding in plane sight.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

A domino effect created with Britain’s iconic telephone boxes.

Collection dedicated to brands, packaging and advertising.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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

One of only three examples of a stained glass window manufactured by the Tiffany Company in Scotland.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

France's most famous cemetery, with some of its most curious tombs.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

A mountaintop space observatory that is certified dark.