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

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

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

This historic timepiece was a popular meeting place for romantic rendezvous in the 1960s.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This Singaporean food-court stall was home to the world's cheapest Michelin-starred meal.

Across this single-file rope bridge is what has been claimed to be the edge of continental Asia.

This fountain was once heralded as the largest in the world.

An independent bookstore and press with a large collection of local and English-language literature.

A manifestation of modernist architectural ideas, this massive, multi-purpose building was one of the first of its kind in Southeast Asia.

A venerated grave atop an ancient royal hill, often attributed to the last king of Singapura.

Rainbow shutters decorate this former police station.

A waterfall runs right through the middle of this Taiwanese shrine to the hundreds of workers killed while building a nearby highway.