The majority of the museum's large collection is held in a storage space open to the public a few times a year.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Unique geological formations in China, featuring some suggestive shapes.

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

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

Intensely colorful calcite pools in Southern China.

Known as the most dangerous bridge in the world, the Hussaini Hanging Bridge is only one of many precarious rope bridges in Northern Pakistan.

Gigantic unfinished stupa and the world's 2nd largest bell.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an 8th-century Buddhist master.

A tunnel dug through the side of a mountain by hand provides convenient yet death-defying access to a small village in China.

A canvas of crops grow from vibrant red soil in this terraced farmland.

A lush desert oasis in the shape of a narrow crescent.

A fifth-century temple improbably built into the side of a cliff.

A harrowing trail up a mile-high mountain.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

An ethereal glowing blue ocean cave in Croatia.