This historic streetcar system has been running since the 19th-century.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

The most northern place on the mainland of Great Britain.

Catacombs turned marketplace.

A wonderfully eccentric Victorian-era museum and library.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

This skewed English house has looked like it's going to fall over for centuries.

One of England's most famous churches hides a pair of little known architectural treasures.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

Open day and night, a church with three pews and Bibles.

Surreal riveted sea forts once protected the Kent shores from German attack.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.

No one is sure what to do with this WWII shipwreck that sits at the bottom of the Thames, still loaded with tons of explosives.

This abandoned gun tower was built to defend the River Thames from a French naval attack.

Considered by many to be one of the most dangerous highways in Alaska.

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

All that remains of the fishing-vessel-turned-warship is its weathered hull.

The wreckage of an old coastal trading vessel is only visible at low tide.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

These fantastically named natural pools look like something out of a Scottish myth.