The stately remains of Llywelyn the Great's mighty fortress.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

Three bridges straddle a stream, one stacked upon the other.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

The decaying ruins of Wales' first asylum for the mentally ill.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

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

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

A gorgeous stone viaduct crosses over a bucolic valley.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

A cableway for car transport.

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

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

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

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.

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

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.

Crammed inside this grounded passenger plane is a bar that was once a Communist hang out and is now a ratty relic.

Dedicated to the unsung history of human waste.

A mansion where wonders of Christmas are celebrated all year long.