The commemorative stone column conceals a secret laboratory.

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

A domino effect created with Britain’s iconic telephone boxes.

This coffee shop lies hidden beneath a historic church.

The last four extravagant street signs of London's historic banking street.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This secluded walkway overlooks a magnificently wild London green space.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

A network of concealed passageways lies within a busy London Underground station.

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

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

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The home of an eccentric Edwardian gentleman is packed to the rafters with handcrafted items collected over a lifetime.

A medieval replica of King Arthur's legendary table, the Round Table hanging in Winchester Castle was decorated by Henry VIII.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

A motley, fantastical agglomeration of unlikely houseboats along the Shoreham-by-Sea riverbank.

An unsanctioned shrine that sprung up outside the late singer's home is causing a stir in London's Highgate neighborhood.

Taxidermied animals galore, by appointment only.

The bizarre headgear looks like it was made for a fool, not a king.