An ancient Viking runestone hidden in plain view in Stockholm's old town.

The 19th-century home of Count and Countess von Hallwyl is now a museum.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

A medieval setting reimagined into a unique art alley.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

Explore the dark underground corridors of this graffiti-covered former military fortification.

The world's largest public collection of PEZ memorabilia.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

A layered tribute to the work of mosaicist Isaiah Zagar.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

The Liverpool street made famous by the Beatles is real.

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

This London plaque marks the spot where David Bowie's famous alien made his debut.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

An artistic tribute to the famous singer, just around the corner from where he was born.

Hear the quietest sound from across the dome.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.