The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

A sculpture park that takes the use of clay to a whole new level.

Shoes and revealing shirts are not allowed inside this giant Vietnamese Christ.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.