A natural arch offers panoramic views of Yangshuo's karst hills.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Come for the flowers, stay for the bats!

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A perfect turquoise lake colored with glacier dust.

Highly spherical boulders on the shores of New Zealand.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

A glacier pocked with ice caves and surrounded by rainforests.

This strange geological landscape erupts with sudden bursts of water.

A giant donut stands as a popular symbol of Los Angeles iconography.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.