Longest fortress system anywhere in Europe.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

An apparition of Virgin Mary in Herzegovina.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Controversial site of what could be Europe's first pyramid.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

Housed in a 1912 architectural masterpiece, this outlet of the Golden Arches is a real beauty.

Visit an imposing 13th-century Transylvanian citadel lurking not far from the region's more heavily touristed attractions.

This Transylvanian church has changed its denomination four times.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

For centuries, Jeddah’s old town was a major trading port and a point of entry for Hajj pilgrims traveling by sea.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

Stone age urban planning.

The ruins of a fairytale castle with a tumultuous history stand high atop the mountains.

The animals wander freely amid this gorgeous stretch of nature.

This museum in a shuttered train station remembers the island's forgotten rail system.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

A Romanian church built from one single oak.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

Rolling sand dunes of the Sahara... in the middle of the Atlantic Ocean.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

A musical instrument played by the sea.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.