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

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

A tiny, remote island packed with wonders both natural and geeky.

This beautiful eden was once the vacation home of Tahitian royals before Marlon Brando bought it.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

One of Europe's largest supercomputers is housed inside of a disused chapel.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

A surrealist labyrinth and museum of contemporary sculptures.

An architect transformed this abandoned cement factory into his castle-like workshop.

A science fiction-inspired apartment building designed by a famous Spanish architect.