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

This memorial to local World War II heroes is slowly being reclaimed by nature.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

Former military fort and site of untold horrors during WWII, this island may become the Adriatic's next luxury resort.

A tiny church on a man-made island in the Adriatic.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Sloth rehabilitation center in the jungle of Costa Rica.

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

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.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

One of the world's oldest olive trees, thought to be over 2,000 years old.

This seaside pine grove features an exclusive watchtower that presents amazing views.

Rent a barrel for a personal view of where the Baltic Sea meets the Gulf of Riga.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

These abandoned vessels are destined to be reclaimed by the forest.

The Latvian city of Ventspils is filled with dozens of cow statues showcasing unique themes.

Inside this medieval church resides a unique set of murals.

With over 10,000 lights, this engineering marvel lights up the city after dark.

This abandoned Greek island was the last active leper colony in Europe.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

This famous archeological mystery may be an ancient example of movable type.