Air-raid tunnels hidden beneath this opulent hotel provided shelter and an escape route—and one of the world's longest slides.

Waste incinerator with a restaurant on its chimney.

A Buddhist temple covered in intricate designs and carvings made out of seashells and pieces of coral.

Once a prosperous mining village, this tiny Taiwanese town is now overrun with cute cats.

A waterfall runs right through the middle of this Taiwanese shrine to the hundreds of workers killed while building a nearby highway.

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

The longest skywalk in Taiwan.

This attraction is part anthropological journey and part amusement park.

This tiny island protects a number of rare bird species by only allowing visitors to set foot on the beach.

Five miles of underground river link lake to ocean.

A church made of steel.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

These tiered rice paddies were carved into the hillsides 2,000 years ago.

This volcano in the Philippines is believed to have miraculous healing powers.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

The world's northernmost aquarium looks like it has fallen over.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

On the cliffs of São Jorge in the Azores stand the remains of a lighthouse that was struck by a series of earthquakes.

Bits of flat terrain surrounded by cliffs make one of the most beautiful landscapes in the Azores.

The world's most remote permanent settlement on an active volcano.

This uninhabited volcanic island is the most remote in the world.

The “Thumb” of Mauritius provides a 360 degree view of the entire country.

On one of the world's most active volcanoes, a pebble-filled crater changes color with the wind.