The final resting place to 300 Victorian-era pets hides inside the city park.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

London's smallest police station is barely the size of a phone booth.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Catacombs turned marketplace.

Remnants of a Victorian garden feature sitting in public woodland.

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

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

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Banksy gives themself artistic license with this piece of London street art.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Northern Ireland's Brobdingnagian stepping stones.

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

The atmospheric road was never meant to be so creepy.

Famously misunderstood wonder of the ancient world

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A kaleidoscopic warehouse-maze of handmade neon signs.