This historic former textile mill now houses a brewery, hotel, and what's believed to be the longest bar in the United Kingdom.

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

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

Long-secret natural history museum, featuring the skull of a "Terror Bird."

England's "pier at the end of the universe" unites astronomy and contemporary architecture.

A small waterfall tucked away in the forest of Harmby Gill.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

This colorful and fiery mural depicts the Irish folk story of the beloved hero Cuchulain.

The oldest public library in Ireland.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Step into Narnia at this small park featuring statues from "The Lion, the Witch, and the Wardrobe."

The only monument to name all of the passengers and crew who died on the RMS Titanic.

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

This Sheffield sculpture composed of 17,000 Allen keys honors both urban falcons and a furniture icon.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

This 20-foot mountain is made up of some 15,000 mannequins—if you visit, you can even take a piece home with you.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

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

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

One of three sites in England that house the National Collection of Arms and Armour.

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.