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

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

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

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

An independent bookstore and press with a large collection of local and English-language literature.

Across this single-file rope bridge is what has been claimed to be the edge of continental Asia.

A former reservoir that was only recently discovered after more than 60 years of disuse.

Terrapins of all colors and shapes are quick to bring fascination (and possibly long life) at this museum.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

The busy transport hub is home to the tallest airport slide in the world.

A Buddhist theme park brings you a Buddhist version of Hell.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

A hidden stream deep in the mountains creates one of the largest tufa waterfalls in Serbia.

This natural monument has an origin story steeped in legend.

These natural stone bridges are the largest on the European continent.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

The ridged layers that make up this river canyon represent Earth's geological history.

An eerie, protected forest of old-growth oak trees, many of which are now dead.

Popular river that runs through the remote Serbian municipality of Leskovac.

A well preserved medieval fortress in Vojvodina.