The twists and turns of this serpentine maze are over 170 years old.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

These picturesque ruins crumble beautifully into the ocean.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This church is said to have connections to the Knights Templars.

A miniature replica of the canine that became the logo for a large recording company.

One of Bristol's best-hidden gems has ties to Lord Byron, whence it became the nation's first reformatory school for girls.

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

Abandoned boats decaying in the largest ship graveyard in mainland Britain.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

A popular day's outing in Bovington consists of watching military tank driving practice.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

A subterranean playground in an abandoned slate mine.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

100 year tradition of fist fights, marked by marble footsteps.

Venice's island of the dead.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.