A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

The remains of Crystal Palace Great Exhibition of 1851.

A cluttered and astounding collection of antiquities and curiosities.

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

A collection dedicated to the treatment of disease, held in London's oldest hospital.

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

Abstract dinosaur models in London.

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

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

Artists and musicians now rule over this former rail station.

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

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

This home on a quiet suburban street is completely covered with vibrant mosaics.

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

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

A famous burial ground with a history both grim and literary.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

A unique seaside cave where Aleister Crowley faked his own death.

The best place in the world to buy tinned fish.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.