Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The beautiful baroque library of the Hapsburg empire.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The solemn exterior conceals an opulent interior of this 17th century church.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Often mistaken as a medieval Gothic monument, this unique cornerstone only dates back to the 1980s.

A relic of the Cold War tucked away in the forested hills above Bratislava.

No one knows the origin of this creepy little stone man with an oversized phallus.

After 11 years of reconstruction work, Slovakia's finest hilltop chapel complex is finally reopen to the public.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

An unusual cave filled with rare alien-looking aragonite formations.

A gorgeous stone viaduct crosses over a bucolic valley.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

A once-fairy tale mansion now stands in a state of disrepair.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

The world's newest astronomical clock is also its most accurate.

A folk-art cottage and hotel straight from a Slavic fairy tale.

A perfectly preserved hill village where the buildings are painted like white lace.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.