Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

Geothermal waterfalls in Tuscany.

The highest waterfall in Italy is only "turned on" five times a year.

Ruins of a 10th century church tucked away deep in a botanical garden.

At this unusual park, domes, ladders, chairs, and more are made from trees.

For centuries, Germans have been dancing in trees.

Living trees form the structure of an open-air palace.

Natural cathedral designed by Italian artist Giuliano Mauri.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Climb inside an iron crystal magnified 165 billion times its normal size.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Walk behind a 50-meter-high waterfall.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

A stunning silver lining to global warming's gloomy cloud.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Survival capsules find a second life as a unique hotel.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

A miniature city, once ruled by the Queen of the Netherlands.

A preserved building where the dead were once watched for signs of life.