A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

This mysterious and unique painting is filled with symbolism.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

A historic hill of tall tales, with one rather special tree.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

This secret garden has bloomed into London's most unique hub of urban creativity.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

The world's oldest optical museum is an odd collection where the exhibits look at you.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

High-end antique collection housed in a centuries-old church.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

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

A comic book store that puts the marvel back in marvellous.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.