The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Public access to clean drinking water was an instant hit among the masses.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

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.

A Roman spa buried deep beneath the City of London.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

A unique waterfall that some believe attracts the fairfolk.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

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

A mysterious artist-run cabinet of curiosities and library.

A network of concealed passageways lies within a busy London Underground station.

A historic house left in "dramatic still life."

A 18th century graveyard and its astonishing cortege of macabre iconography.