An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

The grounds of this Jacobean estate contain one of the oldest mulberry trees in England.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

A memorial to a dog that inspired rioting in the streets of London.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

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.

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

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

An odd museum dedicated to French fakes.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

The history of radiation is on safe display at the foot of a radiation science laboratory.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

France's national museum of scientific and industrial instruments.

France's most famous cemetery, with some of its most curious tombs.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

3,000 family pets and military animals are buried in this London graveyard.

The single richest source of elemental discoveries in the world.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

Tucked inside a South Bank bar is an epic expressionist chronicle of the 20th century.