This hidden green space is the city's second largest conservatory.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

This 1920s Dutch barge is now a floating bookstore.

A hands-off space for graffiti artists to hone and display their skills.

An unusual round church in London with a Templar past.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

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

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

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

The final resting place for the remains of 143 Habsburg royalty.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Catacombs turned marketplace.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

This small chapel is built of human bones and decorated with a golden skeleton.

The fountain marks the area where hundreds of accused witches were burned at the stake.

400-year-old garden, restored to beauty.

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

The longest hedge maze in the world.

The world's only managed flock of mute swans was established as a factory for monk meat but is now an adorable sanctuary.

This secluded walkway overlooks a magnificently wild London green space.

This historic London residence was once the womb of Scientology.

A kaleidoscopic warehouse-maze of handmade neon signs.

Christ's blood allegedly preserved in a Belgian town.