Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Something's watching you.

Packed to the ceiling with antique taxidermy and hunting arms.

A giant concrete Brutalist water tower in suburban Johannesburg.

A mesmerizing sculpture marks the site where the activist was arrested after evading capture for 17 months.

One of the tallest buildings in Africa provides a great view of Johannesburg's unique geography.

Over a million items cram the shelves at Africa's largest shop of used and rare books.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

This rickety old shed hides a trove of secondhand literary treasures.

A giant Australian fruit and tropical farm.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

The only pollutant in the clear blue water is sunscreen.

The loneliest plant in the world resides at the Durban Botanic Gardens...mostly.