Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Spend the night in this formerly abandoned traditional Scottish village.

Remnants of a Victorian garden feature sitting in public woodland.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The atmospheric road was never meant to be so creepy.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This series of Scottish caves has no clear purpose other than baffling historians.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Famously misunderstood wonder of the ancient world

An unusual round church in London with a Templar past.

A little slice of Japan and its aesthetics in London's Holland Park.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Catacombs turned marketplace.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

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

The sign at the garden gate reads: "These Plants Can Kill."

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This 1920s Dutch barge is now a floating bookstore.

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

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

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