The glacier tucked within a New Zealand rainforest.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

America's smallest "national forest" has only 33 trees.

A mysterious and endangered parasitic herb from the California desert.

A vertically floating hemlock controls the waves and weather at Crater Lake.

Queen of the waterlilies, so big and strong it can support the weight of a human.

400-year-old garden, restored to beauty.

Prehistoric park filled with the fossils of dozens of extinct species including Australian megafauna.

Bring your hiking shoes, wool socks, and thermal underwear for a stay in these cozy forest huts.

Site of a former hidden treehouse in New Orleans.

Treehouse motel and treehouse-building school.

A true treehouse near Hawai'i Volcanoes National Park.

A clear example of the process of erosion in action.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Unusual rock formations eroded into a landscape of stone beasts.

Three columns of volcanic rock shoot out of the ocean.

These strikingly barren, rolling red hills were caused by bad farming practices.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

The Twisted Trees of Alticane are an unnerving grove of Quaking Aspen, apparently mutated from a single source, giving them a twisted and unnatural appearance.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.