An isolated dive site teeming with cnidarians.

Fantastically decorated underground chambers built in the 1760s.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

Remnants of a Victorian garden feature sitting in public woodland.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

London's old-school healing garden.

London's largest outsider art museum.

Catacombs turned marketplace.

Floating pink tap installed for a flower show in London.

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

A historic house left in "dramatic still life."

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

Two plaques commemorate the site of Shakespeare's first theatre.

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

Explore nearly 400 years of English middle-class home life.

Taxidermied animals galore, by appointment only.

Traveling collection of amazing automata.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Rebuilt remains of a temple to Roman god Mithras.

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

This South London cemetery holds the remains of more than 15,000 people.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.