London's old-school healing garden.

A historic house left in "dramatic still life."

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Rebuilt remains of a temple to Roman god Mithras.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

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

The largest of London's subterranean rivers and once a mad, bad center of London life.

An unusual round church in London with a Templar past.

A cluttered and astounding collection of antiquities and curiosities.

Hidden beneath the streets of London is a secret subway that only carried mail.

A unique collection of gilded age mechanical pianos.

The world's only museum devoted to the wonders of fluorescence.

Museum preserving torture methods from the past.

A beautifully eclectic mix of architectural styles.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A curious collection dedicated to human and animal anatomy and pathology.