A musical instrument played by the sea.

Outsider Art Community.

An intricately decorated tiny place of worship.

This aquarium has almost as many world records as it does fish.

This picturesque round lake is said to be home to the legendary Mokèlé-mbèmbé.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Underground monastery and fortress.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

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

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

A huge Megalithic chamber tomb located behind a cafe.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

A small, but award-winning beach known for its literally spotless reputation.

The largest tiger reserve in India is a vast expanse dotted with ancient ruins of Nagarjuna Viswa Vidyalayam.

An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

Three prestigious academic collections come together to create a world-class natural history museum.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The best-preserved Roman small town in North Africa.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."