A showcase of canine neckwear spanning five centuries of doggie fashion and function.

This coffee shop lies hidden beneath a historic church.

The grounds of this Jacobean estate contain one of the oldest mulberry trees in England.

Semi-precious Blue John stones have been mined in this cavern system for centuries.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

A hands-off space for graffiti artists to hone and display their skills.

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

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

A remarkable feat of Victorian engineering across the Firth of Forth.

Andrew Carnegie funded the building of almost 3,000 libraries across the world, this was the first.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This ancient Egyptian obelisk still bears the wounds of World War I.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

A mysterious shape catches the eye in this 16th-century painting.

The pockmarks across the building's facade are remnants of the Blitz.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The bronze uniforms commemorate the vital role of women during World War II.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

The Great Fire of London and the regulation of one-way streets both started in this alley.

This Underground station has been a popular filming location for decades, even before it closed.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.