This World War I fortress is the perfect place to catch a Montenegrin sunset.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

The only known mosaic depicting the Greek god of sleep, Hypnos.

A curious cave church carved into the face of a cliff.

A tiny chapel and burial site lurk underground in Jajce.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Trimmed trees grow alongside the graves like topiary tombstones.

The ruins stand as a somber reminder of France’s worst civil catastrophe of the 20th century.

This magical-looking island is notorious for the misfortunes suffered by its owners.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

An Italian hillside ghost town.

This overlooked street light once served as a KGB dead letter box.

A long strip of fossil-filled limestone makes up this natural bridge above a rushing stream.

A cheeky architectural easter egg.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

Village situated on a narrow volcanic escarpment.

This memorial to a horrific ship collision sits over a mass grave holding dozens of the victims.

Twice a day, the water of the Petitcodiac River flows upstream in a surfable wave.

This Canadian monument to the man who invented the telephone allows visitors to get up close and personal with the artifacts of his life.

On the waterfront of Sydney, Nova Scotia, a 60-ft. fiddle greets incoming ships.

The profile of one ill-fated deacon was emblazoned forever on this church window during the Halifax explosion.

The final resting place of 121 victims of the RMS Titanic, 42 of which may never be identified.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.