Slovenia's first mosque is a striking mix of Islamic and modernist architecture.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

Go deep down into the earth to experience the world of Welsh coal miners.

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

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

Bridge that died in war and was resurected.

Monasteries on rock pillars, once accessible only by frayed ropes.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

This Transylvanian church has changed its denomination four times.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A medieval church built up to defend its village.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Gigantic Romanian salt mines used to heal respiratory conditions.

Romania's only crater lake with water as pure as if distilled.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.