This ordinary-looking mailbox has a rather explosive history.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.

A monument to the real explorer and bear who inspired characters in Philip Pullman's 'His Dark Materials.'

Follow the original medieval paths that wind through this intriguing section of the city.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

A poetic monument to the Scottish Parliament.

The final resting place of England's most notorious bandit.

This popular square's history as the former site of a church is right beneath your feet.

The little-known second castle that William the Conqueror built in York.

A Reformation-era fiery figurehead once denoted this location as a print shop.

This medieval church is not only notable for its architecture, but also its connection with LGBTQ+ history.

Glasgow's memorial to the International Brigade volunteers from Great Britain who fought and died in the Spanish Civil War.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

This network of narrow, medieval passages has the most delightful name.

This disused Cold War bunker has been restored to all of its early 60s glory.

This whimsical public art installation is a unique homage to Liverpool's industrial heritage.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.