Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The world's only museum devoted to the wonders of fluorescence.

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

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

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

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

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

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

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

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

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

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

Thousands of costumed dolls fill one of the world's creepiest museums.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

Once the tallest building in Chisinau, this unique tower is a relic of Soviet architecture.

Elaborate mansions built by Roma residents in Soroca to show their success after centuries of discrimination.

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

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The eclectic seaside sanctuary caters to a rather fowl crowd.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.