During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The Avenue of Mausolea is a series of grand palatial tombs.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.

Lonely minaret stump of a destroyed city.

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

Despite a history of destruction, this former citadel survives to document Afghanistan's oft overlooked history.

Splashes of blue in an otherwise monotonous lunar landscape.

Once an impressive link to Afghanistan’s Buddhist past, now a sad reminder of intolerance towards other cultures.

This magnificent blue mosque in Afghanistan is surrounded by thousands of white doves.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

These towering cliffs jut dramatically from the middle of a barren desert.

Space-age minarets towering over Islamabad.

This dazzlingly turquoise mountain lake was created in the wake of a natural disaster.

Snow-capped peaks, colorful waterfalls and stunning vistas on the edge of the Himalayas.

Natural arch offers panoramic views of Yangshuo's karst hills.

This Tang Dynasty behemoth is the biggest Buddha in the world.

270 million year-old forest of stone.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Intensely colorful calcite pools in Southern China.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.

A city entirely devoted to illegal gun production.