A hidden tunnel of bones in one of Malta's oldest churches.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The central mosque of this Mali town is entirely built from mud.

The runoff from these fiery cliffs sends red water flowing into the sea.

See hundreds of herons and egrets in the heart of the city in this dreamy hidden park.

Fabulous formations, weird and wonderful wildlife.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Sculpture garden of religious statues made it through Soviet rule.

Mummies preserved naturally for seven centuries.

A patchwork of ruins from various civilizations in one of the world's oldest continually inhabited cities.

A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.

This remote sandstone cliff has one of the richest collections of Livonian petroglyph marks.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

This mysteriously shaped boulder may have been used for human sacrifice in ancient times.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

These oldest of these "embroidered stones" were carved 4,000 years ago in a high mountain valley.

A stunning blue-green lake located in the Terskey Alatau mountain range.

Glacial lake that mysteriously empties itself every year.

Strange sandstone canyon known as the "place broken by itself."

Drink and dine in a coral cave that's at least 120,000 years old.