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

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Surreal riveted sea forts once protected the Kent shores from German attack.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

A fantastic castle rumored to be the birthplace of King Arthur.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A historic house left in "dramatic still life."

Famously misunderstood wonder of the ancient world

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The signs of a long buried road can still be found hidden beneath a London sewer grate.

A remnant of Korea's colonial past lies forgotten in a hip neighborhood in Seoul.

A chilling monument to Korean patriots who resisted the Japanese occupation.

Surreal giant face-pillars welcome visitors from across the globe to this hotel.

A museum dedicated to the history of Tokyo's often-overlooked working-class district.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

A open air theatre built on a cliff by an eccentric British woman.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

These barriers stand as stark reminders of Northern Ireland's troubled past.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

Every year locals give the bear a fresh coat of paint to preserve its signature goofy grin.

This abandoned oil depot produces world's longest echo in a manmade structure.