The fairy tale castle of the "fairy-tale king."

At 207 feet, one of the world's longest continuous escalators.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This working replica of the 'Friends' coffee shop is more accurate to the show than the set itself.

This probably wasn't what Mao had in mind.

The most famous location in China was home to whole dynasties worth of imperial rulers.

The embalmed remains of the communist leader lie within a custom crystal coffin.

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

A harrowing trail up a mile-high mountain.

This former textile district now is now a thriving center for contemporary Chinese art.

The once highest point in China blends symbolic design with a kick of adrenaline.

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

The latest in a series of long glass bridges suspended at terrifying heights.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

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

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

A battle between nature and architecture in the Cambodian jungle.