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

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

A 17th-century church is nestled within the walls of a 15th-century ruin.

A mysterious crater-like pond has a spooky tendency to empty and fill with complete disregard to rainfall patterns.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A daily replay of the experiment that proved the rotation of the Earth.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

Penn State's giant bug collection.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

These lush botanical gardens employ the most purrfect pest control force.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.