A library of only unpublished manuscripts.

Colorful and chaotic stacked hotel in North Holland.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This former quarry is now a picturesque gorge that hides a sunken lake.

As lake waters recede, a German village reemerges after more than a hundred years.

Bell tower juts out from a village buried under a lake.

Nature took her revenge on the "Wickedest City in the World."

Hidden just under the waters around this Turkish island are the ruins of a once great city.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Stumps of an Ice Age forest, visible only at low tide.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

A treasure trove of rare and fine fabrics from around the world.

More than a century of radio history is told in these displays.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

A stairway to heaven, or to nowhere at all.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

The historic home still shows the scars from a little run-in with the British in 1813.

This tree was extinct for a thousand years before sprouting again from a 2,000-year-old seed.