The curios of pharmacist and collector Henry Wellcome.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

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

The anatomical-pathological collection of a man who changed surgery.

The first green space constructed on an elevated viaduct.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

A celebrated bandstand at the center of what was once the worst slum in London.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

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

Catacombs turned marketplace.

A clock designed to run with perfect accuracy for 10,000 years.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

A faithful reproduction of Al-Jazari's enormous water clock.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Over 80,000 carved wood blocks make up one of the world's oldest intact Buddhist canons.

A perfect turquoise lake colored with glacier dust.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

A theme park made of glass, from the gleaming books on the shelves to the crystal fish in the mirror lake.

World-famous, Pink's still manages to keep its prized cult fetish status.

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.