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

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

A historic arboretum and non-conformist, non-denominational park cemetery.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

This 1920s Dutch barge is now a floating bookstore.

Hear the quietest sound from across the dome.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Aside from denoting a public square or market, this medieval structure was also a sign of a town's prosperity.

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

These sculptures of various animals adorn the building that houses one of the capital's least known museums.

This sculpture of disembodied body parts forms a poignant memory of the horrors of World War II.

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

Nestled among the living residents is the final resting place of an apothecary plague victim.

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

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

One of Edinburgh's oldest pubs hides a 19th-century skittles alley in the back.

This townhouse was once the original home of the Scottish Football Association.