These purpose-built WWII air raid shelters, which run half a kilometer under the town of Mellieħa, are among the longest in Malta.

Explore the flooded remains of a limestone mine in Kentucky.

Does this church in Naples hold the true tomb of Vlad the Impaler, the notoriously cruel figure who inspired Bram Stoker's Dracula?

This site contains preserved ruins and industrial remnants of Western Australia's mining heritage.

A bronze sculpture dedicated a man who transformed the town into a modern tourist destination.

In a city of wooden houses, this watchtower was vital for early fire detection.

Gdańsk's lion mascot features in a trail of bronze sculptures scattered all across the city.

Memorial to the lost dead of Gdansk, whose resting places were destroyed during World War II.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

The site of the first battle of World War II.

This small but lovely sinkhole lake is the last remnant of a great prehistoric water basin.

The collar worn by a fourth-century saint resides in this church, and is still used for blessings to this day.

Just saying the name of this town out loud is said to bring bad luck.

According to the legend, this structure was built in a single night with the help of the devil.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

The origins of a large, medieval castle are shrouded in mystery, but now it's a delightful garden.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A historic freight system that found the true gold rush is in tourism.

This spectacular track has run continuously since 1882.

The oldest steel ship in Iceland has been beached for years and is now a rusting ruin.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.